diff --git a/app/map_styles/polygon.xml b/app/map_styles/polygon.xml
index da299b0d..0499f6c0 100644
--- a/app/map_styles/polygon.xml
+++ b/app/map_styles/polygon.xml
@@ -285,10 +285,6 @@
         </Rule>
     </Style>
     <Style name="landuse">
-        <Rule>
-            <Filter>[current_landuse_order] = "Agriculture And Fisheries"</Filter>
-            <PolygonSymbolizer fill="#52403C" />
-        </Rule>
         <Rule>
             <Filter>[current_landuse_order] = "Recreation And Leisure"</Filter>
             <PolygonSymbolizer fill="#ffbfbf" />
@@ -317,10 +313,6 @@
             <Filter>[current_landuse_order] = "Industry And Business"</Filter>
             <PolygonSymbolizer fill="#f5f58f" />
         </Rule>
-        <Rule>
-            <Filter>[current_landuse_order] = "Vacant And Derelict"</Filter>
-            <PolygonSymbolizer fill="#ffffff" />
-        </Rule>
         <Rule>
             <Filter>[current_landuse_order] = "Defence"</Filter>
             <PolygonSymbolizer fill="#898944" />
diff --git a/app/package-lock.json b/app/package-lock.json
index d886d083..75528e3e 100644
--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -1161,6 +1161,15 @@
       "integrity": "sha512-ijGqzZt/b7BfzcK9vTrS6MFljQRPn5BFWOx8oE0GYxribu6uV+aA9zZuXI1zc/etK9E8nrgdoF2+LgUw7+9tJQ==",
       "dev": true
     },
+    "@types/lodash.isequal": {
+      "version": "4.5.5",
+      "resolved": "https://registry.npmjs.org/@types/lodash.isequal/-/lodash.isequal-4.5.5.tgz",
+      "integrity": "sha512-4IKbinG7MGP131wRfceK6W4E/Qt3qssEFLF30LnJbjYiSfHGGRU/Io8YxXrZX109ir+iDETC8hw8QsDijukUVg==",
+      "dev": true,
+      "requires": {
+        "@types/lodash": "*"
+      }
+    },
     "@types/mapbox__sphericalmercator": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/@types/mapbox__sphericalmercator/-/mapbox__sphericalmercator-1.1.3.tgz",
@@ -2401,7 +2410,7 @@
     },
     "babel-plugin-syntax-object-rest-spread": {
       "version": "6.13.0",
-      "resolved": "http://registry.npmjs.org/babel-plugin-syntax-object-rest-spread/-/babel-plugin-syntax-object-rest-spread-6.13.0.tgz",
+      "resolved": "https://registry.npmjs.org/babel-plugin-syntax-object-rest-spread/-/babel-plugin-syntax-object-rest-spread-6.13.0.tgz",
       "integrity": "sha1-/WU28rzhODb/o6VFjEkDpZe7O/U=",
       "dev": true
     },
@@ -9276,6 +9285,11 @@
       "integrity": "sha1-DM8tiRZq8Ds2Y8eWU4t1rG4RTZ0=",
       "dev": true
     },
+    "lodash.isequal": {
+      "version": "4.5.0",
+      "resolved": "https://registry.npmjs.org/lodash.isequal/-/lodash.isequal-4.5.0.tgz",
+      "integrity": "sha1-QVxEePK8wwEgwizhDtMib30+GOA="
+    },
     "lodash.memoize": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-4.1.2.tgz",
@@ -9715,7 +9729,7 @@
     },
     "mkdirp": {
       "version": "0.5.1",
-      "resolved": "http://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.1.tgz",
       "integrity": "sha1-MAV0OOrGz3+MR2fzhkjWaX11yQM=",
       "requires": {
         "minimist": "0.0.8"
@@ -17138,6 +17152,11 @@
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
       "dev": true
     },
+    "use-throttle": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/use-throttle/-/use-throttle-0.0.3.tgz",
+      "integrity": "sha512-cgA3c+pe6V7cZ7pkLnYnWxXJub2AmksY7YTp/xiZzKesQyECJ1slWknVY2CVZOBf48avbZsAvJIDjO+aFu9+pw=="
+    },
     "util": {
       "version": "0.11.1",
       "resolved": "https://registry.npmjs.org/util/-/util-0.11.1.tgz",
diff --git a/app/package.json b/app/package.json
index 9c9915f5..ced4e36e 100644
--- a/app/package.json
+++ b/app/package.json
@@ -5,6 +5,7 @@
   "private": true,
   "license": "MIT",
   "scripts": {
+    "clean": "rm -rf build",
     "start": "razzle start",
     "build": "razzle build",
     "test": "razzle test --env=jsdom",
@@ -22,6 +23,7 @@
     "express": "^4.17.1",
     "express-session": "^1.17.0",
     "leaflet": "^1.6.0",
+    "lodash.isequal": "^4.5.0",
     "mapnik": "^4.2.1",
     "node-fs": "^0.1.7",
     "nodemailer": "^6.3.0",
@@ -33,13 +35,15 @@
     "react-leaflet-universal": "^1.2.0",
     "react-router-dom": "^5.0.1",
     "serialize-javascript": "^2.1.1",
-    "sharp": "^0.22.1"
+    "sharp": "^0.22.1",
+    "use-throttle": "0.0.3"
   },
   "devDependencies": {
     "@types/express": "^4.17.2",
     "@types/express-session": "^1.15.16",
     "@types/jest": "^24.0.23",
     "@types/lodash": "^4.14.149",
+    "@types/lodash.isequal": "^4.5.5",
     "@types/mapbox__sphericalmercator": "^1.1.3",
     "@types/node": "^12.12.25",
     "@types/nodemailer": "^6.2.2",
diff --git a/app/src/api/api.ts b/app/src/api/api.ts
index efa2bc14..7140b36c 100644
--- a/app/src/api/api.ts
+++ b/app/src/api/api.ts
@@ -1,6 +1,7 @@
 import bodyParser from 'body-parser';
 import express from 'express';
 
+import autofillController from './controllers/autofillController';
 import * as editHistoryController from './controllers/editHistoryController';
 import { ApiParamError, ApiUserError } from './errors/api'; 
 import { DatabaseError } from './errors/general';
@@ -21,6 +22,7 @@ server.use('/users', usersRouter);
 server.use('/extracts', extractsRouter);
 
 server.get('/history', editHistoryController.getGlobalEditHistory);
+server.get('/autofill', autofillController.getAutofillOptions);
 
 // POST user auth
 server.post('/login', function (req, res) {
@@ -101,19 +103,22 @@ server.use((err: any, req: express.Request, res: express.Response, next: express
     }
 
     if (err != undefined) {
-        console.log('Global error handler: ', err);
-        
         if (err instanceof ApiUserError) {
             let errorMessage: string;
-
+            
             if(err instanceof ApiParamError) {
                 errorMessage = `Problem with parameter ${err.paramName}: ${err.message}`;
             } else {
                 errorMessage = err.message;
             }
-
-            res.status(400).send({ error: errorMessage });
-        } else if(err instanceof DatabaseError){
+            
+            return res.status(400).send({ error: errorMessage });
+        }
+        
+        // we need to log the error only if it's not an api user error
+        console.log('Global error handler: ', err);
+        
+        if(err instanceof DatabaseError){
             res.status(500).send({ error: 'Database error' });
         } else {
             res.status(500).send({ error: 'Server error' });
diff --git a/app/src/api/controllers/autofillController.ts b/app/src/api/controllers/autofillController.ts
new file mode 100644
index 00000000..ca6efb7a
--- /dev/null
+++ b/app/src/api/controllers/autofillController.ts
@@ -0,0 +1,17 @@
+import { parseBooleanParam, processParam } from '../parameters';
+import asyncController from '../routes/asyncController';
+import * as autofillService from '../services/autofill';
+
+const getAutofillOptions = asyncController(async (req, res) => {
+    const fieldName = processParam(req.query, 'field_name', x => x, true);
+    const { field_value: fieldValue } = req.query;
+    const allValues = processParam(req.query, 'all_values', parseBooleanParam);
+
+    const options = await autofillService.getAutofillOptions(fieldName, fieldValue, allValues);
+
+    res.send({ options: options });
+});
+
+export default {
+    getAutofillOptions
+};
diff --git a/app/src/api/controllers/buildingController.ts b/app/src/api/controllers/buildingController.ts
index 0bb6ad23..ae6bad41 100644
--- a/app/src/api/controllers/buildingController.ts
+++ b/app/src/api/controllers/buildingController.ts
@@ -1,5 +1,7 @@
 import express from 'express';
 
+import { ApiUserError } from '../errors/api';
+import { UserError } from '../errors/general';
 import { parsePositiveIntParam, processParam } from '../parameters';
 import asyncController from '../routes/asyncController';
 import * as buildingService from '../services/building';
@@ -67,19 +69,17 @@ async function updateBuilding(req: express.Request, res: express.Response, userI
 
     const buildingUpdate = req.body;
 
+    let updatedBuilding: object;
     try {
-        const building = await buildingService.saveBuilding(buildingId, buildingUpdate, userId);
-
-        if (typeof (building) === 'undefined') {
-            return res.send({ error: 'Database error' });
+        updatedBuilding = await buildingService.saveBuilding(buildingId, buildingUpdate, userId);
+    } catch(error) {
+        if(error instanceof UserError) {
+            throw new ApiUserError(error.message, error);
         }
-        if (building.error) {
-            return res.send(building);
-        }
-        res.send(building);
-    } catch(err) {
-        res.send({ error: 'Database error' });
+        throw error;
     }
+
+    res.send(updatedBuilding);
 }
 
 // GET building UPRNs
@@ -137,21 +137,20 @@ const updateBuildingLikeById = asyncController(async (req: express.Request, res:
     const buildingId = processParam(req.params, 'building_id', parsePositiveIntParam, true);
     const { like } = req.body;
 
+    let updatedBuilding: object;
     try {
-        const building = like ?
+        updatedBuilding = like ?
             await buildingService.likeBuilding(buildingId, req.session.user_id) :
             await buildingService.unlikeBuilding(buildingId, req.session.user_id);
-        
-        if (building.error) {
-            return res.send(building);
-        }
-        if (typeof (building) === 'undefined') {
-            return res.send({ error: 'Database error' });
-        }
-        res.send(building);
     } catch(error) {
-        res.send({ error: 'Database error' });
+        if(error instanceof UserError) {
+            throw new ApiUserError(error.message, error);
+        }
+        
+        throw error;
     }
+
+    res.send(updatedBuilding);
 });
 
 const getLatestRevisionId = asyncController(async (req: express.Request, res: express.Response) => {
diff --git a/app/src/api/controllers/editHistoryController.ts b/app/src/api/controllers/editHistoryController.ts
index 2c8dcc8d..b959d685 100644
--- a/app/src/api/controllers/editHistoryController.ts
+++ b/app/src/api/controllers/editHistoryController.ts
@@ -22,8 +22,7 @@ const getGlobalEditHistory = asyncController(async (req: express.Request, res: e
         res.send(result);
     } catch(error) {
         if(error instanceof ArgumentError && error.argumentName === 'count') {
-            const apiErr = new ApiParamError(error.message, 'count');
-            throw apiErr;
+            throw new ApiParamError(error.message, error, 'count');
         }
 
         throw error;
diff --git a/app/src/api/dataAccess/building.ts b/app/src/api/dataAccess/building.ts
new file mode 100644
index 00000000..57dbb0f4
--- /dev/null
+++ b/app/src/api/dataAccess/building.ts
@@ -0,0 +1,82 @@
+
+import { errors, ITask } from 'pg-promise';
+
+import db from '../../db';
+import { ArgumentError, DatabaseError } from '../errors/general';
+
+export async function getBuildingData(
+    buildingId: number,
+    lockForUpdate: boolean = false,
+    t?: ITask<any>
+) {
+    let buildingData;
+    try {
+        buildingData = await (t || db).one(
+            `SELECT * FROM buildings WHERE building_id = $1${lockForUpdate ? ' FOR UPDATE' : ''};`,
+            [buildingId]
+        );
+    } catch(error) {
+        if(
+            error instanceof errors.QueryResultError &&
+            error.code === errors.queryResultErrorCode.noData
+        ) {
+            throw new ArgumentError(`Building ID ${buildingId} does not exist`, 'buildingId');
+        }
+        throw new DatabaseError(error);
+    }
+
+    return buildingData;
+}
+
+export async function insertEditHistoryRevision(
+    buildingId: number,
+    userId: string,
+    forwardPatch: object,
+    reversePatch: object,
+    t?: ITask<any>
+): Promise<string> {
+    try {
+        const { log_id } = await (t || db).one(
+            `INSERT INTO logs (
+                        forward_patch, reverse_patch, building_id, user_id
+                    ) VALUES (
+                        $1:json, $2:json, $3, $4
+                    ) RETURNING log_id
+                    `,
+            [forwardPatch, reversePatch, buildingId, userId]
+        );
+    
+        return log_id;
+    } catch(error) {
+        throw new DatabaseError(error);
+    }
+}
+
+export async function updateBuildingData(
+    buildingId: number,
+    forwardPatch: object,
+    revisionId: string,
+    t?: ITask<any>
+): Promise<object> {
+    const sets = db.$config.pgp.helpers.sets(forwardPatch);
+
+    console.log('Setting', buildingId, sets);
+
+    try {
+        return await (t || db).one(
+            `UPDATE
+                    buildings
+                SET
+                    revision_id = $1,
+                    $2:raw
+                WHERE
+                    building_id = $3
+                RETURNING
+                    *
+                `,
+            [revisionId, sets, buildingId]
+        );
+    } catch(error) {
+        throw new DatabaseError(error);
+    }
+}
diff --git a/app/src/api/dataAccess/landUse.ts b/app/src/api/dataAccess/landUse.ts
new file mode 100644
index 00000000..fbd2bea4
--- /dev/null
+++ b/app/src/api/dataAccess/landUse.ts
@@ -0,0 +1,49 @@
+import db from '../../db';
+
+export async function getLandUseGroupFromClass(classes: string[]): Promise<string[]> {
+    if (classes.length === 0) return [];
+
+    return (await db.many(
+        `
+        SELECT DISTINCT parent.description
+        FROM reference_tables.buildings_landuse_group AS parent
+        JOIN reference_tables.buildings_landuse_class AS child
+        ON child.parent_group_id = parent.landuse_id
+        WHERE child.description IN ($1:csv)
+        ORDER BY parent.description`,
+        [classes]
+    )).map(x => x.description);
+}
+
+export async function getLandUseOrderFromGroup(groups: string[]): Promise<string> {
+    if(groups.length === 0) return null;
+
+    const orders = (await db.many(
+        `
+        SELECT DISTINCT parent.description
+        FROM reference_tables.buildings_landuse_order AS parent
+        JOIN reference_tables.buildings_landuse_group AS child
+        ON child.parent_order_id = parent.landuse_id
+        WHERE child.description IN ($1:csv)
+        ORDER BY parent.description
+        `,
+        [groups]
+    )).map(x => x.description);
+
+    if(orders.length === 1) {
+        return orders[0];
+    } else if (orders.length > 1) {
+        return 'Mixed Use';
+    } else return null;
+}
+
+export async function isLandUseGroupAllowed(group: string): Promise<boolean> {
+    let groupResult = await db.oneOrNone(`
+        SELECT landuse_id
+        FROM reference_tables.buildings_landuse_group
+        WHERE description = $1
+        `, [group]
+    );
+
+    return (groupResult != undefined);
+}
diff --git a/app/src/api/dataAccess/like.ts b/app/src/api/dataAccess/like.ts
new file mode 100644
index 00000000..a9b91174
--- /dev/null
+++ b/app/src/api/dataAccess/like.ts
@@ -0,0 +1,47 @@
+import { errors, ITask } from 'pg-promise';
+
+import db from '../../db';
+import { DatabaseError, InvalidOperationError } from '../errors/general';
+
+export async function getBuildingLikeCount(buildingId: number, t?: ITask<any>): Promise<number> {
+    try {
+        const result  = await (t || db).one(
+            'SELECT count(*) as likes FROM building_user_likes WHERE building_id = $1;',
+            [buildingId]
+        );
+        
+        return result.likes;
+    } catch(error) {
+        throw new DatabaseError(error);
+    }
+}
+
+export async function addBuildingUserLike(buildingId: number, userId: string, t?: ITask<any>): Promise<void> {
+    try {
+        return await (t || db).none(
+            'INSERT INTO building_user_likes ( building_id, user_id ) VALUES ($1, $2);',
+            [buildingId, userId]
+        );
+    } catch(error) {
+        if(error.detail?.includes('already exists')) {
+            throw new InvalidOperationError('User already likes this building');
+        }
+        throw new DatabaseError(error);
+    }
+}
+
+export async function removeBuildingUserLike(buildingId: number, userId: string, t?: ITask<any>): Promise<void> {
+    let result;
+    try {
+        result = await t.result(
+            'DELETE FROM building_user_likes WHERE building_id = $1 AND user_id = $2;',
+            [buildingId, userId]
+        );
+    } catch(error) {
+        throw new DatabaseError(error);
+    }
+
+    if (result.rowCount === 0) {
+        throw new InvalidOperationError("User doesn't like the building, cannot unlike");
+    }
+}
diff --git a/app/src/api/errors/api.ts b/app/src/api/errors/api.ts
index cbc4ba2f..6223ffe3 100644
--- a/app/src/api/errors/api.ts
+++ b/app/src/api/errors/api.ts
@@ -6,39 +6,34 @@
  */
 
 export class ApiUserError extends Error {
-    constructor(message?: string) {
+    public originalError: Error;
+    constructor(message?: string, originalError?: Error) {
         super(message);
         this.name = 'ApiUserError';
+        this.originalError = originalError;
     }
 }
 
 export class ApiParamError extends ApiUserError {
     public paramName: string;
 
-    constructor(message?: string, paramName?: string) {
-        super(message);
+    constructor(message?: string, originalError?: Error, paramName?: string) {
+        super(message, originalError);
         this.name = 'ApiParamError';
         this.paramName = paramName;
     }
 }
 
 export class ApiParamRequiredError extends ApiParamError {
-    constructor(message?: string) {
-        super(message);
+    constructor(message?: string, originalError?: Error) {
+        super(message, originalError);
         this.name = 'ApiParamRequiredError';
     }
 }
 
-export class ApiParamOutOfBoundsError extends ApiParamError {
-    constructor(message?: string) {
-        super(message);
-        this.name = 'ApiParamOutOfBoundsError';
-    }
-}
-
 export class ApiParamInvalidFormatError extends ApiParamError {
-    constructor(message?: string) {
-        super(message);
+    constructor(message?: string, originalError?: Error) {
+        super(message, originalError);
         this.name = 'ApiParamInvalidFormatError';
     }
 }
diff --git a/app/src/api/errors/general.ts b/app/src/api/errors/general.ts
index faacdb41..df3dc648 100644
--- a/app/src/api/errors/general.ts
+++ b/app/src/api/errors/general.ts
@@ -1,4 +1,11 @@
-export class ArgumentError extends Error {
+export class UserError extends Error {
+    constructor(message?: string) {
+        super(message);
+        this.name = 'UserError';
+    }
+}
+
+export class ArgumentError extends UserError {
     public argumentName: string;
     constructor(message?: string, argumentName?: string) {
         super(message);
@@ -7,6 +14,13 @@ export class ArgumentError extends Error {
     }
 }
 
+export class InvalidOperationError extends UserError {
+    constructor(message?: string) {
+        super(message);
+        this.name = 'InvalidOperationError';
+    }
+}
+
 export class DatabaseError extends Error {
     public detail: any;
     constructor(detail?: string) {
diff --git a/app/src/api/parameters.ts b/app/src/api/parameters.ts
index 865c0947..9656b854 100644
--- a/app/src/api/parameters.ts
+++ b/app/src/api/parameters.ts
@@ -33,6 +33,15 @@ export function parsePositiveIntParam(param: string) {
     return result;
 }
 
+export function parseBooleanParam(param: string) {
+    if(param == undefined) return undefined;
+
+    if(param === 'true') return true;
+    if(param === 'false') return false;
+
+    throw new ApiParamInvalidFormatError('Invalid format: not a true/false value');
+}
+
 export function checkRegexParam(param: string, regex: RegExp): string {
     if(param == undefined) return undefined;
 
diff --git a/app/src/api/services/__tests__/domainLogic/landUse.test.ts b/app/src/api/services/__tests__/domainLogic/landUse.test.ts
new file mode 100644
index 00000000..c7b5bf7a
--- /dev/null
+++ b/app/src/api/services/__tests__/domainLogic/landUse.test.ts
@@ -0,0 +1,126 @@
+import * as _ from 'lodash';
+
+import { ArgumentError } from '../../../errors/general';
+import { LandUseState, updateLandUse } from '../../domainLogic/landUse';
+
+const testGroupToOrder = {
+    'Agriculture': 'Agriculture And Fisheries',
+    'Fisheries': 'Agriculture And Fisheries',
+    'Manufacturing': 'Industry And Business',
+    'Offices': 'Industry And Business'
+};
+
+const testAllowedGroups = Object.keys(testGroupToOrder);
+
+jest.mock('../../../dataAccess/landUse', () => ({
+    getLandUseOrderFromGroup: jest.fn((groups: string[]) => {
+        const orders = _.chain(groups).map(g => testGroupToOrder[g]).uniq().value();
+
+        let result: string;
+        if(orders.length == 0) result = null;
+        else if(orders.length == 1) result = orders[0];
+        else result = 'Mixed Use';
+        
+        return Promise.resolve(result);
+    }),
+    isLandUseGroupAllowed: jest.fn((group: string) => {
+        return testAllowedGroups.includes(group);
+    })
+}));
+
+describe('updateLandUse()', () => {
+
+    beforeEach(() => {
+        jest.clearAllMocks();
+    });
+
+    it.each([
+        [{
+            landUseGroup: [],
+            landUseOrder: null
+        }, {
+            landUseGroup: ['Agriculture']
+        }, {
+            landUseGroup: ['Agriculture'],
+            landUseOrder: 'Agriculture And Fisheries'
+        }],
+
+        [{
+            landUseGroup: ['Agriculture'],
+            landUseOrder: 'Agriculture And Fisheries'
+        }, {
+            landUseGroup: ['Fisheries']
+        }, {
+            landUseGroup: ['Fisheries'],
+            landUseOrder: 'Agriculture And Fisheries'
+        }],
+
+        [{
+            landUseGroup: ['Agriculture'],
+            landUseOrder: 'Agriculture And Fisheries'
+        }, {
+            landUseGroup: ['Agriculture', 'Offices'],
+        }, {
+            landUseGroup: ['Agriculture', 'Offices'],
+            landUseOrder: 'Mixed Use'
+        }]
+    ])('Should derive land use order from group',
+        async (landUse: LandUseState, landUseUpdate: Partial<LandUseState>, expectedUpdate: LandUseState) => {
+            const result = await updateLandUse(landUse, landUseUpdate);
+
+            expect(result).toEqual(expectedUpdate);
+        }
+    );
+
+    it.each([
+        [{
+            landUseGroup: ['Agriculture'],
+            landUseOrder: 'Agriculture And Fisheries'
+        }, {
+            landUseGroup: []
+        }, {
+            landUseGroup: [],
+            landUseOrder: null
+        }],
+
+        [{
+            landUseGroup: ['Agriculture', 'Offices'],
+            landUseOrder: 'Mixed Use',
+        }, {
+            landUseGroup: ['Agriculture'],
+        }, {
+            landUseGroup: ['Agriculture'],
+            landUseOrder: 'Agriculture And Fisheries'
+        }]
+    ])('Should remove derived land use order when land use group is removed',
+        async (landUse: LandUseState, landUseUpdate: Partial<LandUseState>, expectedUpdate: LandUseState) => {
+            const result = await updateLandUse(landUse, landUseUpdate);
+
+            expect(result).toEqual(expectedUpdate);
+        }
+    );
+
+    it.each([
+        [['Blah'], "'Blah' is not a valid Land Use Group"],
+        [['Agriculture', 'Zonk'], "'Zonk' is not a valid Land Use Group"],
+        [['Zonk', 'Blah'], "'Zonk' is not a valid Land Use Group"]
+    ])('Should throw ArgumentError when invalid land use group supplied', async (groups: string[], message: string) => {
+        const resultPromise = updateLandUse({landUseGroup: [], landUseOrder: null}, { landUseGroup: groups});
+
+        await expect(resultPromise).rejects.toBeInstanceOf(ArgumentError);
+        await expect(resultPromise).rejects.toHaveProperty('argumentName', 'landUseUpdate');
+        await expect(resultPromise).rejects.toHaveProperty('message', message);
+    });
+
+    it('Should throw ArgumentError when duplicate land use groups supplied', async () => {
+        const resultPromise = updateLandUse(
+            {landUseGroup: [], landUseOrder: null},
+            { landUseGroup: ['Agriculture', 'Agriculture']}
+        );
+
+        await expect(resultPromise).rejects.toBeInstanceOf(ArgumentError);
+        await expect(resultPromise).rejects.toHaveProperty('argumentName', 'landUseUpdate');
+        await expect(resultPromise).rejects.toHaveProperty('message', 'Cannot supply duplicate Land Use Groups');
+    });
+
+});
diff --git a/app/src/api/services/autofill.ts b/app/src/api/services/autofill.ts
new file mode 100644
index 00000000..8021a277
--- /dev/null
+++ b/app/src/api/services/autofill.ts
@@ -0,0 +1,56 @@
+import db from '../../db';
+
+interface AutofillOption {
+    id: string;
+    value: string;
+    similarity?: number;
+}
+
+type GetAutofillOptionsFn = (value: string, all?: boolean) => Promise<AutofillOption[]>;
+
+const autofillFunctionMap : { [fieldName: string] : GetAutofillOptionsFn } = {
+    current_landuse_group: getLanduseGroupOptions,
+};
+
+
+function getLanduseGroupOptions(value: string, all: boolean = false) {
+    if(all) {
+        return db.manyOrNone(`
+            SELECT
+                landuse_id AS id,
+                description AS value
+            FROM reference_tables.buildings_landuse_group
+            `
+        );
+    }
+
+    let query = buildPartialMatchQuery(value);
+
+    return db.manyOrNone(`
+        SELECT
+            landuse_id AS id,
+            description AS value,
+            ts_rank(to_tsvector('simple', description), to_tsquery('simple', $1)) AS similarity
+        FROM reference_tables.buildings_landuse_group
+        WHERE to_tsvector('simple', description) @@ to_tsquery('simple', $1)
+        ORDER BY similarity DESC, description
+        `, [query]
+    );
+}
+
+function buildPartialMatchQuery(value: string) {
+    return tokenizeValue(value).map(x => `${x}:*`).join(' & ');
+}
+function tokenizeValue(value: string) {
+    return value.split(/[^\w]+/).filter(x => x !== '');
+}
+
+export function getAutofillOptions(fieldName: string, fieldValue: any, allValues: boolean) {
+    const optionsFn = autofillFunctionMap[fieldName];
+
+    if (optionsFn == undefined) {
+        throw new Error(`Autofill options not available for field '${fieldName}'`);
+    }
+
+    return optionsFn(fieldValue, allValues);
+}
diff --git a/app/src/api/services/building.ts b/app/src/api/services/building.ts
index 79511324..7d195371 100644
--- a/app/src/api/services/building.ts
+++ b/app/src/api/services/building.ts
@@ -8,6 +8,9 @@ import { ITask } from 'pg-promise';
 import db from '../../db';
 import { tileCache } from '../../tiles/rendererDefinition';
 import { BoundingBox } from '../../tiles/types';
+import * as buildingDataAccess from '../dataAccess/building';
+import * as likeDataAccess from '../dataAccess/like';
+import { UserError } from '../errors/general';
 
 import { processBuildingUpdate } from './domainLogic/processBuildingUpdate';
 
@@ -155,83 +158,50 @@ async function getBuildingUPRNsById(id: number) {
     }
 }
 
-async function saveBuilding(buildingId: number, building: any, userId: string) { // TODO add proper building type
-    try {
-        return await updateBuildingData(buildingId, userId, async () => {
-            const processedBuilding = await processBuildingUpdate(buildingId, building);
-            
-            // remove read-only fields from consideration
-            delete processedBuilding.building_id;
-            delete processedBuilding.revision_id;
-            delete processedBuilding.geometry_id;
+async function saveBuilding(buildingId: number, building: any, userId: string): Promise<object> { // TODO add proper building type
+    return await updateBuildingData(buildingId, userId, async () => {
+        const processedBuilding = await processBuildingUpdate(buildingId, building);
+        
+        // remove read-only fields from consideration
+        delete processedBuilding.building_id;
+        delete processedBuilding.revision_id;
+        delete processedBuilding.geometry_id;
 
-            // return whitelisted fields to update
-            return pickAttributesToUpdate(processedBuilding, BUILDING_FIELD_WHITELIST);
-        });
-    } catch(error) {
-        console.error(error);
-        return { error: error };
-    }
+        // return whitelisted fields to update
+        return pickAttributesToUpdate(processedBuilding, BUILDING_FIELD_WHITELIST);
+    });
 }
 
 async function likeBuilding(buildingId: number, userId: string) {
-    try {
-        return await updateBuildingData(
-            buildingId,
-            userId,
-            async (t) => {
-                // return total like count after update
-                return getBuildingLikeCount(buildingId, t);
-            },
-            async (t) => {
-                // insert building-user like
-                await t.none(
-                    'INSERT INTO building_user_likes ( building_id, user_id ) VALUES ($1, $2);',
-                    [buildingId, userId]
-                );
-            },
-        );
-    } catch (error) {
-        console.error(error);
-        if (error.detail && error.detail.includes('already exists')) {
-            // 'already exists' is thrown if user already liked it
-            return { error: 'It looks like you already like that building!' };
-        } else {
-            return undefined;
-        }
-    }
+    return await updateBuildingData(
+        buildingId,
+        userId,
+        async (t) => {
+            // return total like count after update
+            return {
+                likes_total: await likeDataAccess.getBuildingLikeCount(buildingId, t)
+            };
+        },
+        (t) => {
+            return likeDataAccess.addBuildingUserLike(buildingId, userId, t);
+        },
+    );
 }
 
 async function unlikeBuilding(buildingId: number, userId: string) {
-    try {
-        return await updateBuildingData(
-            buildingId,
-            userId,
-            async (t) => {
-                // return total like count after update
-                return getBuildingLikeCount(buildingId, t);
-            },
-            async (t) => {
-                // remove building-user like
-                const result = await t.result(
-                    'DELETE FROM building_user_likes WHERE building_id = $1 AND user_id = $2;',
-                    [buildingId, userId]
-                );
-
-                if (result.rowCount === 0) {
-                    throw new Error('No change');
-                }
-            },
-        );
-    } catch(error) {
-        console.error(error);
-        if (error.message === 'No change') {
-            // 'No change' is thrown if user doesn't like this building
-            return { error: 'It looks like you have already revoked your like for that building!' };
-        } else {
-            return undefined;
-        }
-    }
+    return await updateBuildingData(
+        buildingId,
+        userId,
+        async (t) => {
+            // return total like count after update
+            return {
+                likes_total: await likeDataAccess.getBuildingLikeCount(buildingId, t)
+            };
+        },
+        async (t) => {
+            return likeDataAccess.removeBuildingUserLike(buildingId, userId, t);
+        },
+    );
 }
 
 // === Utility functions ===
@@ -246,18 +216,6 @@ function pickAttributesToUpdate(obj: any, fieldWhitelist: Set<string>) {
     return subObject;
 }
 
-/**
- * 
- * @param buildingId ID of the building to count likes for
- * @param t The database context inside which the count should happen
- */
-function getBuildingLikeCount(buildingId: number, t: ITask<unknown>) {
-    return t.one(
-        'SELECT count(*) as likes_total FROM building_user_likes WHERE building_id = $1;',
-        [buildingId]
-    );
-}
-
 /**
  * Carry out an update of the buildings data. Allows for running any custom database operations before the main update.
  * All db hooks get passed a transaction.
@@ -271,7 +229,7 @@ async function updateBuildingData(
     userId: string,
     getUpdateValue: (t: ITask<any>) => Promise<object>,
     preUpdateDbAction?: (t: ITask<any>) => Promise<void>,
-) {
+): Promise<object> {
     return await db.tx({mode: serializable}, async t => {
         if (preUpdateDbAction != undefined) {
             await preUpdateDbAction(t);
@@ -279,49 +237,23 @@ async function updateBuildingData(
 
         const update = await getUpdateValue(t);
 
-        const oldBuilding = await t.one(
-            'SELECT * FROM buildings WHERE building_id = $1 FOR UPDATE;',
-            [buildingId]
-        );
+        const oldBuilding = await buildingDataAccess.getBuildingData(buildingId, true, t);
 
         console.log(update);
         const patches = compare(oldBuilding, update);
         console.log('Patching', buildingId, patches);
         const [forward, reverse] = patches;
         if (Object.keys(forward).length === 0) {
-            throw 'No change provided';
+            throw new UserError('No change provided');
         }
 
-        const revision = await t.one(
-            `INSERT INTO logs (
-                        forward_patch, reverse_patch, building_id, user_id
-                    ) VALUES (
-                        $1:json, $2:json, $3, $4
-                    ) RETURNING log_id
-                    `,
-            [forward, reverse, buildingId, userId]
-        );
+        const revisionId = await buildingDataAccess.insertEditHistoryRevision(buildingId, userId, forward, reverse, t);
 
-        const sets = db.$config.pgp.helpers.sets(forward);
-        console.log('Setting', buildingId, sets);
-
-        const data = await t.one(
-            `UPDATE
-                    buildings
-                SET
-                    revision_id = $1,
-                    $2:raw
-                WHERE
-                    building_id = $3
-                RETURNING
-                    *
-                `,
-            [revision.log_id, sets, buildingId]
-        );
+        const updatedData = await buildingDataAccess.updateBuildingData(buildingId, forward, revisionId, t);
 
         expireBuildingTileCache(buildingId);
 
-        return data;
+        return updatedData;
     });
 }
 
@@ -405,7 +337,7 @@ const BUILDING_FIELD_WHITELIST = new Set([
     'building_attachment_form',
     'date_change_building_use',
 
-    'current_landuse_class',
+    // 'current_landuse_class',
     'current_landuse_group',
     'current_landuse_order'
 ]);
diff --git a/app/src/api/services/domainLogic/currentLandUseClassifications.ts b/app/src/api/services/domainLogic/currentLandUseClassifications.ts
deleted file mode 100644
index e15a9244..00000000
--- a/app/src/api/services/domainLogic/currentLandUseClassifications.ts
+++ /dev/null
@@ -1,102 +0,0 @@
-import * as _ from 'lodash';
-
-import db from '../../../db';
-import { isNullishOrEmpty } from '../../../helpers';
-import { getCurrentBuildingDataById } from '../building';
-
-export async function processCurrentLandUseClassifications(buildingId: number, building: any): Promise<any> {
-    let updateData = _.pick(await getCurrentBuildingDataById(buildingId), [
-        'current_landuse_class',
-        'current_landuse_group',
-        'current_landuse_order'
-    ]);
-    
-    updateData = Object.assign({}, updateData, getClearValues(building));
-    
-    const updateFrom = getUpdateStartingStage(building);
-    if(updateFrom === 'class') {
-        updateData.current_landuse_class = building.current_landuse_class;
-        updateData.current_landuse_group = await deriveGroupFromClass(updateData.current_landuse_class);
-        updateData.current_landuse_order = await deriveOrderFromGroup(updateData.current_landuse_group);
-    } else if (updateFrom === 'group') {
-        if (isNullishOrEmpty(updateData.current_landuse_class)) {
-            updateData.current_landuse_group = building.current_landuse_group;
-            updateData.current_landuse_order = await deriveOrderFromGroup(building.current_landuse_group);
-        } else {
-            throw new Error('Trying to update current_landuse_group field but a more detailed field (current_landuse_class) is already filled');
-        }
-    } else if (updateFrom === 'order') {
-        if (isNullishOrEmpty(updateData.current_landuse_class) && isNullishOrEmpty(updateData.current_landuse_group)) {
-            updateData.current_landuse_order = building.current_landuse_order;
-        } else {
-            throw new Error('Trying to update current_landuse_order field but a more detailed field (current_landuse_class or current_landuse_group) is already filled');
-        }
-    }
-
-    return Object.assign({}, building, updateData);
-}
-
-function getClearValues(building) {
-    const clearValues: any = {};
-    if(building.hasOwnProperty('current_landuse_class') && isNullishOrEmpty(building.current_landuse_class)) {
-        clearValues.current_landuse_class = [];
-    }
-    if(building.hasOwnProperty('current_landuse_group') && isNullishOrEmpty(building.current_landuse_group)) {
-        clearValues.current_landuse_group = [];
-    }
-    if(building.hasOwnProperty('current_landuse_order') && isNullishOrEmpty(building.current_landuse_order)) {
-        clearValues.current_landuse_order = null;
-    }
-
-    return clearValues;
-}
-/**
- * Choose which level of the land use classification hierarchy the update should start from.
- * @param building 
- */
-function getUpdateStartingStage(building) {
-    if(building.hasOwnProperty('current_landuse_class') && !isNullishOrEmpty(building.current_landuse_class)) {
-        return 'class';
-    } else if(building.hasOwnProperty('current_landuse_group') && !isNullishOrEmpty(building.current_landuse_group)) {
-        return 'group';
-    } else if(building.hasOwnProperty('current_landuse_order') && !isNullishOrEmpty(building.current_landuse_order)) {
-        return 'order';
-    } else return 'none';
-}
-
-async function deriveGroupFromClass(classes: string[]): Promise<string[]> {
-    if (classes.length === 0) return [];
-
-    return (await db.many(
-        `
-        SELECT DISTINCT parent.description
-        FROM reference_tables.buildings_landuse_group AS parent
-        JOIN reference_tables.buildings_landuse_class AS child
-        ON child.parent_group_id = parent.landuse_id
-        WHERE child.description IN ($1:csv)
-        ORDER BY parent.description`,
-        [classes]
-    )).map(x => x.description);
-}
-
-async function deriveOrderFromGroup(groups: string[]): Promise<string> {
-    if(groups.length === 0) return null;
-
-    const orders = (await db.many(
-        `
-        SELECT DISTINCT parent.description
-        FROM reference_tables.buildings_landuse_order AS parent
-        JOIN reference_tables.buildings_landuse_group AS child
-        ON child.parent_order_id = parent.landuse_id
-        WHERE child.description IN ($1:csv)
-        ORDER BY parent.description
-        `,
-        [groups]
-    )).map(x => x.description);
-
-    if(orders.length === 1) {
-        return orders[0];
-    } else if (orders.length > 1) {
-        return 'Mixed Use';
-    } else return null;
-}
diff --git a/app/src/api/services/domainLogic/landUse.ts b/app/src/api/services/domainLogic/landUse.ts
new file mode 100644
index 00000000..8ca8dbb3
--- /dev/null
+++ b/app/src/api/services/domainLogic/landUse.ts
@@ -0,0 +1,35 @@
+import _ from 'lodash';
+
+import * as landUseDataAccess from '../../dataAccess/landUse';
+import { ArgumentError } from '../../errors/general';
+
+export interface LandUseState {
+    landUseGroup: string[];
+    landUseOrder: string;
+}
+
+export async function updateLandUse(landUse: LandUseState, landUseUpdate: Partial<LandUseState>): Promise<LandUseState> {
+    const landUseGroupUpdate = landUseUpdate.landUseGroup;
+
+    for(let group of landUseGroupUpdate) {
+        const isGroupValid = await landUseDataAccess.isLandUseGroupAllowed(group);
+        if(!isGroupValid) {
+            throw new ArgumentError(`'${group}' is not a valid Land Use Group`, 'landUseUpdate');
+        }
+    }
+
+    if(hasDuplicates(landUseGroupUpdate)) {
+        throw new ArgumentError('Cannot supply duplicate Land Use Groups', 'landUseUpdate');
+    }
+
+    const landUseOrderUpdate = await landUseDataAccess.getLandUseOrderFromGroup(landUseGroupUpdate);
+
+    return {
+        landUseGroup: landUseGroupUpdate,
+        landUseOrder: landUseOrderUpdate
+    };
+}
+
+function hasDuplicates(array: any[]) {
+    return (new Set(array).size !== array.length);
+}
diff --git a/app/src/api/services/domainLogic/processBuildingUpdate.ts b/app/src/api/services/domainLogic/processBuildingUpdate.ts
index 7b7d166f..2b2cc7ca 100644
--- a/app/src/api/services/domainLogic/processBuildingUpdate.ts
+++ b/app/src/api/services/domainLogic/processBuildingUpdate.ts
@@ -1,11 +1,40 @@
+import * as _ from 'lodash';
+
 import { hasAnyOwnProperty } from '../../../helpers';
+import { ArgumentError } from '../../errors/general';
+import { getCurrentBuildingDataById } from '../building';
 
-import { processCurrentLandUseClassifications } from './currentLandUseClassifications';
+import { updateLandUse } from './landUse';
 
-export async function processBuildingUpdate(buildingId: number, building: any): Promise<any> {
-    if(hasAnyOwnProperty(building, ['current_landuse_class', 'current_landuse_group', 'current_landuse_order'])) {
-        building = await processCurrentLandUseClassifications(buildingId, building);
+export async function processBuildingUpdate(buildingId: number, buildingUpdate: any): Promise<any> {
+    if(hasAnyOwnProperty(buildingUpdate, ['current_landuse_group'])) {
+        buildingUpdate = await processCurrentLandUseClassifications(buildingId, buildingUpdate);
     }
 
-    return building;
+    return buildingUpdate;
+}
+
+async function processCurrentLandUseClassifications(buildingId: number, buildingUpdate: any): Promise<any> {
+    const currentBuildingData = await getCurrentBuildingDataById(buildingId);
+
+    try {
+        const currentLandUseUpdate = await updateLandUse(
+            {
+                landUseGroup: currentBuildingData.current_landuse_group,
+                landUseOrder: currentBuildingData.current_landuse_order
+            }, {
+                landUseGroup: buildingUpdate.current_landuse_group
+            }
+        );
+
+        return Object.assign({}, buildingUpdate, {
+            current_landuse_group: currentLandUseUpdate.landUseGroup,
+            current_landuse_order: currentLandUseUpdate.landUseOrder,
+        });
+    } catch (error) {
+        if(error instanceof ArgumentError && error.argumentName === 'landUseUpdate') {
+            error.argumentName = 'buildingUpdate';
+        }
+        throw error;
+    }
 }
diff --git a/app/src/frontend/building/data-components/autofill-dropdown/autofill-dropdown.css b/app/src/frontend/building/data-components/autofill-dropdown/autofill-dropdown.css
new file mode 100644
index 00000000..26e412f7
--- /dev/null
+++ b/app/src/frontend/building/data-components/autofill-dropdown/autofill-dropdown.css
@@ -0,0 +1,26 @@
+.autofill-dropdown {
+    position: absolute;
+    top: 100%;
+    z-index: 1000;
+
+    max-height: 6em;
+    width: 100%;
+    overflow-x: hidden;
+    overflow-y: scroll;
+    
+    box-sizing: content-box;
+    padding: 0.2em;
+    border: 1px solid #ddd;
+    
+    background-color: white;
+    box-shadow: 2px 2px 2px gray;
+}
+
+.autofill-dropdown div {
+    padding-left: 0.3em;
+}
+
+.autofill-dropdown div:hover {
+    background-color: aliceblue;
+    cursor: pointer;
+}
\ No newline at end of file
diff --git a/app/src/frontend/building/data-components/autofill-dropdown/autofill-dropdown.tsx b/app/src/frontend/building/data-components/autofill-dropdown/autofill-dropdown.tsx
new file mode 100644
index 00000000..380892f7
--- /dev/null
+++ b/app/src/frontend/building/data-components/autofill-dropdown/autofill-dropdown.tsx
@@ -0,0 +1,77 @@
+import React, { useEffect, useState } from 'react';
+import { useThrottle } from 'use-throttle';
+
+import './autofill-dropdown.css';
+
+import { apiGet } from '../../../apiHelpers';
+
+interface AutofillDropdownProps {
+    fieldName: string;
+    fieldValue: string;
+    showAllOptionsOnEmpty?: boolean;
+    editing: boolean;
+    onSelect: (val: string) => void;
+    onClose: () => void;
+}
+
+interface AutofillOption {
+    id: string;
+    value: string;
+    similarity: number;
+}
+
+export const AutofillDropdown: React.FC<AutofillDropdownProps> =  props => {
+    const [options, setOptions] = useState<AutofillOption[]>(null);
+
+    // use both throttled and debounced field value as trigger for update
+    const throttledFieldValue = useThrottle(props.fieldValue, 1000);
+
+    useEffect(() => {
+        const doAsync = async () => {
+            if (!props.editing) return setOptions(null);
+
+            let valueParam: string;
+
+            if(props.fieldValue == null) {
+                if(!props.showAllOptionsOnEmpty) {
+                    if(options == null) return setOptions(null);
+                } else {
+                    valueParam = 'all_values=true';
+                }
+            } else {
+                valueParam = `field_value=${props.fieldValue}`;
+            }
+
+            const url = `/api/autofill?field_name=${props.fieldName}&${valueParam}`;
+            const { options: newOptions } = await apiGet(url);
+
+            if (!props.editing) return;
+
+            setOptions(newOptions);
+        };
+
+        doAsync();
+    }, [props.editing, props.fieldName, throttledFieldValue]);
+
+    if (!props.editing || options == undefined) return null;
+
+    return (
+        <div className="autofill-dropdown">
+            {
+                options.map(option =>
+                    <div
+                        key={option.id}
+                        onMouseDown={e => /* prevent input blur */ e.preventDefault()}
+                        onClick={e => {
+                            props.onSelect(option.value);
+                            // close dropdown manually rather than through input blur
+                            props.onClose();
+                        }}
+                    >
+                        {option.value} ({option.id})
+                    </div>)
+            }
+        </div>
+    );
+
+};
diff --git a/app/src/frontend/building/data-components/data-entry-input.tsx b/app/src/frontend/building/data-components/data-entry-input.tsx
new file mode 100644
index 00000000..d21f8a51
--- /dev/null
+++ b/app/src/frontend/building/data-components/data-entry-input.tsx
@@ -0,0 +1,89 @@
+import React, { useState } from 'react';
+
+import { AutofillDropdown } from './autofill-dropdown/autofill-dropdown';
+
+export interface TextDataEntryInputProps {
+    slug: string;
+    name?: string;
+    id?: string;
+    onChange?: (key: string, val: any) => void;
+    onConfirm?: (key: string, val: any) => void;
+
+    maxLength?: number;
+    disabled?: boolean;
+    placeholder?: string;
+    valueTransform?: (val: string) => string;
+    confirmOnEnter?: boolean;
+
+    autofill?: boolean;
+    showAllOptionsOnEmpty?: boolean;
+    confirmOnAutofillSelect?: boolean;
+}
+
+export const DataEntryInput: React.FC<TextDataEntryInputProps & {value?: string}> = props => {
+    const [isEditing, setEditing] = useState(false);
+    const nameAttr = props.name || props.slug;
+    const idAttr = props.id || props.slug;
+
+    const transformValue = (value: string) => {
+        const transform = props.valueTransform || (x => x);
+        const transformedValue = value === '' ?
+                        null :
+                        transform(value);
+        return transformedValue;
+    };
+
+    const handleChange = (value: string) => {
+        props.onChange?.(props.slug, transformValue(value));
+    };
+    
+    const handleConfirm = () => {
+        props.onConfirm?.(props.slug, props.value);
+    };
+
+    const handleAutofillSelect = (value: string) => {
+        const transformedValue = transformValue(value);
+        if(props.confirmOnAutofillSelect) {
+            props.onConfirm?.(props.slug, transformedValue);
+        } else {
+            props.onChange?.(props.slug, transformedValue);
+        }
+    };
+
+    return (
+        <>
+            <input className="form-control" type="text"
+                id={idAttr}
+                name={nameAttr}
+                value={props.value || ''}
+                maxLength={props.maxLength}
+                disabled={props.disabled}
+                placeholder={props.placeholder}
+                onKeyDown={e => {
+                    if(e.keyCode === 13) {
+                        // prevent form submit on enter
+                        e.preventDefault();
+                        if(props.confirmOnEnter) {
+                            handleConfirm();
+                        }
+                    }
+                }}
+                onChange={e => handleChange(e.target.value)}
+                onInput={e => setEditing(true)}
+                onFocus={e => setEditing(true)}
+                onBlur={e => setEditing(false)}
+            />
+            {
+                props.autofill &&
+                <AutofillDropdown
+                    editing={isEditing}
+                    onSelect={handleAutofillSelect}
+                    onClose={() => setEditing(false)}
+                    fieldName={props.slug}
+                    fieldValue={props.value}
+                    showAllOptionsOnEmpty={props.showAllOptionsOnEmpty}
+                />
+            }
+        </>
+    );
+};
diff --git a/app/src/frontend/building/data-components/data-entry.tsx b/app/src/frontend/building/data-components/data-entry.tsx
index 1e1bfca0..7c45bca0 100644
--- a/app/src/frontend/building/data-components/data-entry.tsx
+++ b/app/src/frontend/building/data-components/data-entry.tsx
@@ -2,6 +2,7 @@ import React, { Fragment } from 'react';
 
 import { CopyProps } from '../data-containers/category-view-props';
 
+import { DataEntryInput, TextDataEntryInputProps } from './data-entry-input';
 import { DataTitleCopyable } from './data-title';
 
 interface BaseDataEntryProps {
@@ -14,14 +15,11 @@ interface BaseDataEntryProps {
     onChange?: (key: string, value: any) => void;
 }
 
-interface DataEntryProps extends BaseDataEntryProps {
+interface DataEntryProps extends BaseDataEntryProps, TextDataEntryInputProps {
     value?: string;
-    maxLength?: number;
-    placeholder?: string;
-    valueTransform?: (string) => string;
 }
 
-const DataEntry: React.FunctionComponent<DataEntryProps> = (props) => {
+const DataEntry: React.FC<DataEntryProps> = (props) => {
     return (
         <Fragment>
             <DataTitleCopyable
@@ -31,20 +29,15 @@ const DataEntry: React.FunctionComponent<DataEntryProps> = (props) => {
                 disabled={props.disabled || props.value == undefined || props.value == ''}
                 copy={props.copy}
             />
-            <input className="form-control" type="text"
-                id={props.slug}
-                name={props.slug}
-                value={props.value || ''}
-                maxLength={props.maxLength}
+            <DataEntryInput
+                slug={props.slug}
+                value={props.value}
+                onChange={props.onChange}
                 disabled={props.mode === 'view' || props.disabled}
+                
+                maxLength={props.maxLength}
                 placeholder={props.placeholder}
-                onChange={e => {
-                    const transform = props.valueTransform || (x => x);
-                    const val = e.target.value === '' ?
-                                    null :
-                                    transform(e.target.value);
-                    props.onChange(props.slug, val);
-                }}
+                valueTransform={props.valueTransform}
             />
         </Fragment>
     );
diff --git a/app/src/frontend/building/data-components/multi-data-entry.tsx b/app/src/frontend/building/data-components/multi-data-entry.tsx
deleted file mode 100644
index e51e7d8c..00000000
--- a/app/src/frontend/building/data-components/multi-data-entry.tsx
+++ /dev/null
@@ -1,105 +0,0 @@
-import React, { Component, Fragment } from 'react';
-
-import { sanitiseURL } from '../../helpers';
-
-import { BaseDataEntryProps } from './data-entry';
-import { DataTitleCopyable } from './data-title';
-
-
-interface MultiDataEntryProps extends BaseDataEntryProps {
-    value: string[];
-    placeholder: string;
-}
-
-class MultiDataEntry extends Component<MultiDataEntryProps> {
-
-    constructor(props) {
-        super(props);
-        this.edit = this.edit.bind(this);
-        this.add = this.add.bind(this);
-        this.remove = this.remove.bind(this);
-        this.getValues = this.getValues.bind(this);
-    }
-
-    getValues() {
-        return (this.props.value && this.props.value.length)? this.props.value : [null];
-    }
-
-    edit(event) {
-        const editIndex = +event.target.dataset.index;
-        const editItem = event.target.value;
-        const oldValues = this.getValues();
-        const values = oldValues.map((item, i) => {
-            return i === editIndex ? editItem : item;
-        });
-        this.props.onChange(this.props.slug, values);
-    }
-
-    add(event) {
-        event.preventDefault();
-        const values = this.getValues().concat('');
-        this.props.onChange(this.props.slug, values);
-    }
-
-    remove(event){
-        const removeIndex = +event.target.dataset.index;
-        const values = this.getValues().filter((_, i) => {
-            return i !== removeIndex;
-        });
-        this.props.onChange(this.props.slug, values);
-    }
-
-    render() {
-        const values = this.getValues();
-        const props = this.props;
-        return <Fragment>
-            <DataTitleCopyable
-                slug={props.slug}
-                title={props.title}
-                tooltip={props.tooltip}
-                disabled={props.disabled || props.value == undefined || props.value.length === 0}
-            />
-            {
-                (props.mode === 'view')?
-                    (props.value && props.value.length)?
-                        <ul className="data-link-list">
-                        {
-                            props.value.map((item, index) => {
-                                return <li
-                                    key={index}
-                                    className="form-control">
-                                    <a href={sanitiseURL(item)}>{item}</a>
-                                </li>;
-                            })
-                        }
-                        </ul>
-                    :'\u00A0'
-                : values.map((item, i) => (
-                    <div className="input-group" key={i}>
-                        <input className="form-control" type="text"
-                            key={`${props.slug}-${i}`} name={`${props.slug}-${i}`}
-                            data-index={i}
-                            value={item || ''}
-                            placeholder={props.placeholder}
-                            disabled={props.disabled}
-                            onChange={this.edit}
-                        />
-                        <div className="input-group-append">
-                            <button type="button" onClick={this.remove}
-                                title="Remove"
-                                data-index={i} className="btn btn-outline-dark">✕</button>
-                        </div>
-                    </div>
-                ))
-            }
-            <button
-                type="button"
-                title="Add"
-                onClick={this.add}
-                disabled={props.mode === 'view'}
-                className="btn btn-outline-dark">+</button>
-        </Fragment>;
-    }
-}
-
-export default MultiDataEntry;
diff --git a/app/src/frontend/building/data-components/multi-data-entry/multi-data-entry.css b/app/src/frontend/building/data-components/multi-data-entry/multi-data-entry.css
new file mode 100644
index 00000000..e18692e7
--- /dev/null
+++ b/app/src/frontend/building/data-components/multi-data-entry/multi-data-entry.css
@@ -0,0 +1,5 @@
+.input-group .no-entries {
+    border-style: dashed;
+    border-color: #aaa;
+    margin-bottom: 0.4em;
+}
\ No newline at end of file
diff --git a/app/src/frontend/building/data-components/multi-data-entry/multi-data-entry.tsx b/app/src/frontend/building/data-components/multi-data-entry/multi-data-entry.tsx
new file mode 100644
index 00000000..8a5bb075
--- /dev/null
+++ b/app/src/frontend/building/data-components/multi-data-entry/multi-data-entry.tsx
@@ -0,0 +1,162 @@
+import React, { Component, Fragment } from 'react';
+
+import './multi-data-entry.css';
+
+import { BaseDataEntryProps } from '../data-entry';
+import { DataEntryInput, TextDataEntryInputProps } from '../data-entry-input';
+import { DataTitleCopyable } from '../data-title';
+
+
+interface MultiDataEntryProps extends BaseDataEntryProps, TextDataEntryInputProps {
+    value: string[];
+    editableEntries: boolean;
+    confirmOnEnter: boolean;
+
+    addOnAutofillSelect: boolean;
+    acceptAutofillValuesOnly: boolean;
+}
+
+interface MultiDataEntryState {
+    newValue: string;
+}
+
+class MultiDataEntry extends Component<MultiDataEntryProps, MultiDataEntryState> {
+
+    static defaultProps = {
+        editableEntries: false,
+        confirmOnEnter: true,
+        addOnAutofillSelect: false,
+        acceptAutofillValuesOnly: false
+    };
+
+    constructor(props) {
+        super(props);
+        this.state = {
+            newValue: null
+        };
+        
+        this.setNewValue = this.setNewValue.bind(this);
+        this.edit = this.edit.bind(this);
+        this.addNew = this.addNew.bind(this);
+        this.remove = this.remove.bind(this);
+    }
+
+    getValues() {
+        return this.props.value == undefined ? [] : this.props.value;
+    }
+
+    cloneValues() {
+        return this.getValues().slice();
+    }
+
+    setNewValue(value: string) {
+        this.setState({newValue: value});
+    }
+
+    edit(index: number, value: string) {
+        let values = this.cloneValues();
+        values.splice(index, 1, value);
+        this.props.onChange(this.props.slug, values);
+    }
+    addNew(newValue?: string) {
+        // accept a newValue parameter to handle cases where the value is set and submitted at the same time
+        // (like with autofill select enabled) - but otherwise use the current newValue saved in state
+        const val = newValue ?? this.state.newValue;
+        if (val == undefined) return;
+        const values = this.cloneValues().concat(val);
+        this.setState({newValue: null});
+        this.props.onChange(this.props.slug, values);
+    }
+
+    remove(index: number){
+        const values = this.cloneValues();
+        values.splice(index, 1);
+        this.props.onChange(this.props.slug, values);
+    }
+
+    render() {
+        const values = this.getValues();
+        const props = this.props;
+        const isEditing = props.mode === 'edit';
+        const isDisabled = !isEditing || props.disabled;
+        return <Fragment>
+            <DataTitleCopyable
+                slug={props.slug}
+                title={props.title}
+                tooltip={props.tooltip}
+                disabled={props.disabled || props.value == undefined || props.value.length === 0}
+            />
+            <div id={`${props.slug}-wrapper`}>
+                <ul className="data-link-list">
+                {
+                    values.length === 0 && !isEditing &&
+                    <div className="input-group">
+                        <input className="form-control no-entries" type="text" value="No entries" disabled={true} />
+                    </div>
+                }
+                {
+                    values.map((val, i) => (
+                        <li className="input-group" key={i /* i as key prevents input component recreation on edit */}>
+                            <DataEntryInput
+                                slug={props.slug}
+                                name={`${props.slug}-${i}`}
+                                id={`${props.slug}-${i}`}
+                                value={val}
+                                disabled={!props.editableEntries || isDisabled}
+                                onChange={(key, val) => this.edit(i, val)}
+
+                                maxLength={props.maxLength}
+                                valueTransform={props.valueTransform}
+
+                                autofill={props.autofill}
+                                showAllOptionsOnEmpty={props.showAllOptionsOnEmpty}
+                            />
+                            {
+                                !isDisabled &&
+                                <div className="input-group-append">
+                                    <button type="button" onClick={e => this.remove(i)}
+                                        title="Remove"
+                                        data-index={i} className="btn btn-outline-dark">✕</button>
+                                </div>
+                            }
+                        </li>
+                    ))
+                }
+                </ul>
+                {
+                    !isDisabled &&
+                    <div className="input-group">
+                        <DataEntryInput
+                            slug={props.slug}
+                            name={`${props.slug}`}
+                            id={`${props.slug}`}
+                            value={this.state.newValue}
+                            disabled={props.disabled}
+                            onChange={(key, val) => this.setNewValue(val)}
+                            onConfirm={(key, val) => this.addNew(val)}
+
+                            maxLength={props.maxLength}
+                            placeholder={props.placeholder}
+                            valueTransform={props.valueTransform}
+                            confirmOnEnter={props.confirmOnEnter}
+
+                            autofill={props.autofill}
+                            showAllOptionsOnEmpty={props.showAllOptionsOnEmpty}
+                            confirmOnAutofillSelect={true}
+                        />
+                        <div className="input-group-append">
+                            <button type="button"
+                                className="btn btn-outline-dark"
+                                title="Add to list"
+                                onClick={() => this.addNew()}
+                                disabled={this.state.newValue == undefined}
+                            >+</button>
+                        </div>
+                    </div>
+                }
+            </div>
+        </Fragment>;
+    }
+}
+
+export default MultiDataEntry;
diff --git a/app/src/frontend/building/data-containers/age.tsx b/app/src/frontend/building/data-containers/age.tsx
index 1be202d7..f5de0a2b 100644
--- a/app/src/frontend/building/data-containers/age.tsx
+++ b/app/src/frontend/building/data-containers/age.tsx
@@ -1,7 +1,7 @@
 import React, { Fragment } from 'react';
 
 import { dataFields } from '../../data_fields';
-import MultiDataEntry from '../data-components/multi-data-entry';
+import MultiDataEntry from '../data-components/multi-data-entry/multi-data-entry';
 import NumericDataEntry from '../data-components/numeric-data-entry';
 import SelectDataEntry from '../data-components/select-data-entry';
 import TextboxDataEntry from '../data-components/textbox-data-entry';
@@ -82,6 +82,7 @@ const AgeView: React.FunctionComponent<CategoryViewProps> = (props) => {
                 onChange={props.onChange}
                 tooltip={dataFields.date_link.tooltip}
                 placeholder="https://..."
+                editableEntries={true}
                 />
         </Fragment>
     );
diff --git a/app/src/frontend/building/data-containers/use.tsx b/app/src/frontend/building/data-containers/use.tsx
index 2701b17f..7efb7614 100644
--- a/app/src/frontend/building/data-containers/use.tsx
+++ b/app/src/frontend/building/data-containers/use.tsx
@@ -3,7 +3,7 @@ import React, { Fragment } from 'react';
 import InfoBox from '../../components/info-box';
 import { dataFields } from '../../data_fields';
 import DataEntry from '../data-components/data-entry';
-import MultiDataEntry from '../data-components/multi-data-entry';
+import MultiDataEntry from '../data-components/multi-data-entry/multi-data-entry';
 import withCopyEdit from '../data-container';
 
 import { CategoryViewProps } from './category-view-props';
@@ -13,32 +13,31 @@ import { CategoryViewProps } from './category-view-props';
  */
 const UseView: React.FunctionComponent<CategoryViewProps> = (props) => (
     <Fragment>
-        <InfoBox msg="This category is currently read-only. We are working on enabling its editing soon." />
-        <MultiDataEntry
-            title={dataFields.current_landuse_class.title}
-            slug="current_landuse_class"
-            value={props.building.current_landuse_class}
-            mode="view"
-            copy={props.copy}
-            onChange={props.onChange}
-            // tooltip={dataFields.current_landuse_class.tooltip}
-            placeholder="New land use class..."
-        />
         <MultiDataEntry
             title={dataFields.current_landuse_group.title}
             slug="current_landuse_group"
             value={props.building.current_landuse_group}
-            mode="view"
+            mode={props.mode}
             copy={props.copy}
             onChange={props.onChange}
-            // tooltip={dataFields.current_landuse_class.tooltip}
-            placeholder="New land use group..."
+            confirmOnEnter={true}
+            tooltip={dataFields.current_landuse_group.tooltip}
+            placeholder="Type new land use group here"
+            autofill={true}
+            showAllOptionsOnEmpty={true}
+            addOnAutofillSelect={true}
         />
+        {
+            props.mode != 'view' &&
+            <InfoBox msg="Land use order is automatically derived from the land use groups"></InfoBox>
+        }
         <DataEntry
             title={dataFields.current_landuse_order.title}
+            tooltip={dataFields.current_landuse_order.tooltip}
             slug="current_landuse_order"
             value={props.building.current_landuse_order}
-            mode="view"
+            mode={props.mode}
+            disabled={true}
             copy={props.copy}
             onChange={props.onChange}
         />
diff --git a/app/src/frontend/components/tooltip.css b/app/src/frontend/components/tooltip.css
index 950f4736..c48a446f 100644
--- a/app/src/frontend/components/tooltip.css
+++ b/app/src/frontend/components/tooltip.css
@@ -21,3 +21,7 @@
 .tooltip .arrow {
     right: 7px;
 }
+
+.tooltip a {
+    color: rgb(255, 11, 245);
+}
\ No newline at end of file
diff --git a/app/src/frontend/components/tooltip.tsx b/app/src/frontend/components/tooltip.tsx
index 631ba720..5ab49bb3 100644
--- a/app/src/frontend/components/tooltip.tsx
+++ b/app/src/frontend/components/tooltip.tsx
@@ -12,28 +12,64 @@ interface TooltipState {
     active: boolean;
 }
 
+const nonCaptureLingRegex = /\[[^[]+?\]\([^(]+?\)/;
+const linkRegex = /\[([^[]+?)\]\(([^(]+?)\)/;
+
+function markdownLinkToAnchor(link: string) {
+    const m = link.match(linkRegex);
+        return (<a href={m[2]} target="_blank">{m[1]}</a>);
+}
+
+function interweave(arr1: any[], arr2: any[]): any[] {
+    const commonLen = Math.min(arr1.length, arr2.length);
+    const arr = [];
+    for(let i=0; i<commonLen; i++) {
+        arr.push(arr1[i], arr2[i]);
+    }
+    arr.push(...arr1.slice(commonLen), ...arr2.slice(commonLen));
+
+    return arr;
+}
+
+function tooltipTextToComponents(text: string): any[] {
+    let betweenLinks = text.split(nonCaptureLingRegex);
+    if(betweenLinks.length <= 1) return [text];
+    let links = text.match(new RegExp(linkRegex, 'g')).map(markdownLinkToAnchor);
+
+    return interweave(betweenLinks, links);
+}
+
 class Tooltip extends Component<TooltipProps, TooltipState> {
     constructor(props) {
         super(props);
         this.state = {
             active: false
         };
-        this.handleClick = this.handleClick.bind(this);
+
+        this.toggleVisible = this.toggleVisible.bind(this);
+        this.handleBlur = this.handleBlur.bind(this);
     }
 
-    handleClick(event) {
-        event.preventDefault();
-        this.setState({
-            active: !this.state.active
-        });
+    
+    toggleVisible() {
+        this.setState(state => ({
+                active: !state.active
+        }));
+    }
+
+    handleBlur(event) {
+        if(!event.currentTarget.contains(event.relatedTarget)) {
+            this.setState({
+                active: false
+            });
+        }
     }
 
     render() {
         return (
-            <div className="tooltip-wrap">
-                <button className={(this.state.active? 'active ': '') + 'tooltip-hint icon-button'}
-                    title={this.props.text}
-                    onClick={this.handleClick}>
+            <div className="tooltip-wrap" tabIndex={0} onBlur={this.handleBlur}>
+                <button type="button" className={(this.state.active? 'active ': '') + 'tooltip-hint icon-button'}
+                    onClick={this.toggleVisible}>
                     Hint
                     <InfoIcon />
                 </button>
@@ -42,7 +78,9 @@ class Tooltip extends Component<TooltipProps, TooltipState> {
                         (
                             <div className="tooltip bs-tooltip-bottom">
                                 <div className="arrow"></div>
-                                <div className="tooltip-inner">{this.props.text}</div>
+                                <div className="tooltip-inner">
+                                    {tooltipTextToComponents(this.props.text)}
+                                </div>
                             </div>
                         )
                         : null
diff --git a/app/src/frontend/data_fields.ts b/app/src/frontend/data_fields.ts
index 7e46cdad..ecb9233b 100644
--- a/app/src/frontend/data_fields.ts
+++ b/app/src/frontend/data_fields.ts
@@ -153,17 +153,15 @@ export const dataFields = {
         title: "Longitude",
     },
 
-    current_landuse_class: {
-        category: Category.LandUse,
-        title: "Current Land Use Class"
-    },
     current_landuse_group: {
         category: Category.LandUse,
-        title: "Current Land Use Group"
+        title: "Current Land Use (Group)",
+        tooltip: "Land use Groups as classified by [NLUD](https://www.gov.uk/government/statistics/national-land-use-database-land-use-and-land-cover-classification)"
     },
     current_landuse_order: {
         category: Category.LandUse,
-        title: "Current Land Use Order"
+        title: "Current Land Use (Order)",
+        tooltip: "Land use Order as classified by [NLUD](https://www.gov.uk/government/statistics/national-land-use-database-land-use-and-land-cover-classification)"
     },
 
     building_attachment_form: {
diff --git a/app/src/frontend/helpers.ts b/app/src/frontend/helpers.ts
index 9648c708..be3b5a27 100644
--- a/app/src/frontend/helpers.ts
+++ b/app/src/frontend/helpers.ts
@@ -1,3 +1,4 @@
+import isEqual from 'lodash.isequal';
 import urlapi from 'url';
 
 function sanitiseURL(string){
@@ -66,7 +67,7 @@ function compareObjects(objA: object, objB: object): [object, object] {
     const reverse = {};
     const forward = {};
     for (const [key, value] of Object.entries(objB)) {
-        if (objA[key] !== value) {
+        if (!isEqual(objA[key], value)) {
             reverse[key] = objA[key];
             forward[key] = value;
         }
diff --git a/app/src/frontend/map/legend.tsx b/app/src/frontend/map/legend.tsx
index 52eb01db..7f29fafa 100644
--- a/app/src/frontend/map/legend.tsx
+++ b/app/src/frontend/map/legend.tsx
@@ -23,14 +23,12 @@ const LEGEND_CONFIG = {
             { color: '#4a54a6', text: 'Residential' },
             { color: '#e5050d', text: 'Mixed Use' },
             { color: '#ff8c00', text: 'Retail' },
-            { color: '#f5f58f', text: 'Industry And Business' },
+            { color: '#f5f58f', text: 'Industry & Business' },
             { color: '#73ccd1', text: 'Community Services' },
-            { color: '#ffbfbf', text: 'Recreation And Leisure' },
+            { color: '#ffbfbf', text: 'Recreation & Leisure' },
             { color: '#b3de69', text: 'Transport' },
-            { color: '#cccccc', text: 'Utilities And Infrastructure' },
-            { color: '#52403C', text: 'Agriculture And Fisheries' },
+            { color: '#cccccc', text: 'Utilities & Infrastructure' },
             { color: '#898944', text: 'Defence' },
-            { color: '#ffffff', text: 'Vacant And Derelict' },
         ]
     },
     type: {
diff --git a/app/tsconfig.json b/app/tsconfig.json
index 9b4ebd04..10ab0397 100644
--- a/app/tsconfig.json
+++ b/app/tsconfig.json
@@ -13,5 +13,9 @@
     "files": [
         "./src/index.ts",
         "./src/client.tsx"
+    ],
+    "include": [
+        "./src/**/*.test.*",
+        "./src/**/*.spec.*"
     ]
 }
\ No newline at end of file
diff --git a/maintenance/extract_data/README.txt b/maintenance/extract_data/README.txt
index 54db7145..909f18d2 100644
--- a/maintenance/extract_data/README.txt
+++ b/maintenance/extract_data/README.txt
@@ -41,7 +41,6 @@ This is the main table, containing almost all data collected by Colouring London
 - `location_postcode`: postcode
 - `location_latitude`: latitude
 - `location_longitude`: longitude
-- `current_landuse_class`: current land use class
 - `current_landuse_group`: current land use group
 - `current_landuse_order`: current land use order
 - `building_attachment_form`: building attachment form
diff --git a/maintenance/extract_data/export_attributes.sql b/maintenance/extract_data/export_attributes.sql
index 87159603..4e797a8d 100644
--- a/maintenance/extract_data/export_attributes.sql
+++ b/maintenance/extract_data/export_attributes.sql
@@ -11,7 +11,6 @@ COPY (SELECT
     location_postcode,
     location_latitude,
     location_longitude,
-    current_landuse_class,
     current_landuse_group,
     current_landuse_order,
     building_attachment_form,