Data sources and licences
- ONS Census 2021 (tables TS054 tenure, TS044 accommodation type, TS046 central heating), via Nomis. Open Government Licence v3.0. Covers England & Wales only. Scotland's Census 2022 is published separately by NRS and will be added.
- OS Open Names and ONS Postcode Directory via postcodes.io. Contains OS data © Crown copyright and database right; Royal Mail data © Royal Mail copyright and database right; National Statistics data © Crown copyright and database right. OGL v3.0.
- City zone populations: Census 2021 usual residents by postcode district (ONS via Nomis, table P004, OGL) and Scotland's Census 2022 postcode counts (National Records of Scotland, OGL), summed to postcode district.
- Postcode districts list (active postcodes, households, population from the 2011 Census) from Doogal, derived from ONSPD (OGL).
- GeoNames gazetteer populations. CC BY 4.0, geonames.org.
- Wikipedia summaries (neutral geography only). CC BY-SA 4.0, linked on each page.
- Map tiles © OpenStreetMap contributors, ODbL.
- EPC register (epc.opendatacommunities.org) local counts and rating mix: planned. Needs a free API key and is not used yet.