Add tooltip to postcode

app/src/frontend/building/data-containers/location.tsx

@@ -147,6 +147,7 @@ const LocationView: React.FunctionComponent<CategoryViewProps> = (props) => {
                     onChange={props.onChange}
                     maxLength={8}
                     valueTransform={x=>x.toUpperCase()}
+                    tooltip={dataFields.location_postcode.tooltip}
                     />
                 <Verification
                     slug="location_postcode"

app/src/frontend/config/data-fields-config.ts

@@ -182,7 +182,7 @@ export const dataFields = { /* eslint-disable @typescript-eslint/camelcase */
         category: Category.Location,
         title: "Area code/"+ccconfig.postcode,
         example: "W1W 6TR",
-        //tooltip: ,
+        tooltip: "Correctly formatted UK postcode, i.e. NW1 2FB",
     },
     location_address_source: {
         category: Category.Location,