diff --git a/app/package-lock.json b/app/package-lock.json
index 863102e4..d48c1474 100644
--- a/app/package-lock.json
+++ b/app/package-lock.json
@@ -8193,6 +8193,11 @@
       "integrity": "sha512-MmbQJ2MTESTjt3Gi/3yG1wGpIMhUfcIypUCGtTizFR9IiccFwxSpfp0vtIZlkFclEqERemxfnSdZEMR9VqqEFQ==",
       "dev": true
     },
+    "node-fs": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/node-fs/-/node-fs-0.1.7.tgz",
+      "integrity": "sha1-MjI8zLRsn78PwRgS1FAhzDHTJbs="
+    },
     "node-int64": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/node-int64/-/node-int64-0.4.0.tgz",
@@ -8931,7 +8936,7 @@
         },
         "semver": {
           "version": "4.3.2",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-4.3.2.tgz",
+          "resolved": "http://registry.npmjs.org/semver/-/semver-4.3.2.tgz",
           "integrity": "sha1-x6BxWKgL7dBSNVt3DYLWZA+AO+c="
         }
       }
@@ -12070,7 +12075,7 @@
       "dependencies": {
         "minimist": {
           "version": "1.2.0",
-          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
         }
       }
diff --git a/app/package.json b/app/package.json
index 85ac3b81..1b7906c1 100644
--- a/app/package.json
+++ b/app/package.json
@@ -22,6 +22,7 @@
     "express-session": "^1.15.6",
     "leaflet": "^1.4.0",
     "mapnik": "^4.2.1",
+    "node-fs": "^0.1.7",
     "pg-promise": "^8.5.6",
     "react": "^16.8.3",
     "react-dom": "^16.8.3",
diff --git a/app/src/frontend/map.js b/app/src/frontend/map.js
index 959e8355..a49da6fe 100644
--- a/app/src/frontend/map.js
+++ b/app/src/frontend/map.js
@@ -98,7 +98,7 @@ class ColouringMap extends Component {
             <TileLayer
                 key={data_tileset}
                 url={`/tiles/${data_tileset}/{z}/{x}/{y}.png?rev=${rev}`}
-                minZoom={14} />
+                minZoom={9} />
             : null;
 
         // highlight
@@ -120,7 +120,7 @@ class ColouringMap extends Component {
                 <Map
                     center={position}
                     zoom={this.state.zoom}
-                    minZoom={10}
+                    minZoom={9}
                     maxZoom={18}
                     doubleClickZoom={false}
                     zoomControl={false}
diff --git a/app/src/tiles/cache.js b/app/src/tiles/cache.js
index 56deb167..de233721 100644
--- a/app/src/tiles/cache.js
+++ b/app/src/tiles/cache.js
@@ -12,8 +12,11 @@
  *   at zoom level n
  *
  */
-import fs from 'fs';
-import path from 'path';
+
+// Using node-fs package to patch fs
+// for node >10 we could drop this in favour of fs.mkdir (which has recursive option)
+// and then use stdlib `import fs from 'fs';`
+import fs from 'node-fs';
 
 // const CACHE_PATH = process.env.CACHE_PATH
 const CACHE_PATH = '/home/tom/projects/colouring-london/colouring-london/app/tilecache'
@@ -37,31 +40,21 @@ function put(im, tileset, z, x, y, cb){
     const fname = `${dir}/${y}.png`
     fs.writeFile(fname, im, 'binary', (err) => {
         if (err && err.code === 'ENOENT') {
-            try {
-                console.log("trying")
-                mkdir_recursive(dir);
-                fs.writeFile(fname, im, 'binary', cb);
-            } catch (error) {
-                console.log("mkdir error")
-                cb(err);
-            }
+            fs.mkdir(dir, 0o755, true, (err) => {
+                if (err){
+                    cb(err);
+                } else {
+                    fs.writeFile(fname, im, 'binary', cb);
+                }
+            });
         } else {
             cb(err)
         }
     });
 }
 
-// for node >10 we could drop this in favour of fs.mkdir(dir, { recursive: true }, (err) => {})
-function mkdir_recursive(dir) {
-    const parent = path.dirname(dir);
-    if (!fs.existsSync(parent)) {
-        mkdir_recursive(parent)
-    }
-    fs.mkdirSync(dir);
-}
-
 function should_try_cache(tileset, z) {
-    if (tileset === 'base_light' ||  tileset === 'base_light') {
+    if (tileset === 'base_light' ||  tileset === 'base_night') {
         // cache for higher zoom levels (unlikely to change)
         return z <= 15
     }