The address layer. Resolves the row to a real building and the structured datasets keyed to it.
postcodes.io
UK postcode + admin geography lookup. Resolves to lat/lng, LSOA, ward, parliamentary constituency and region: the keys downstream postcode-indexed datasets need.
ONS Open Government Licence v3.0 · source
OS Open UPRN
Ordnance Survey Unique Property Reference Numbers. When a UPRN is supplied we resolve to property-precision coordinates (a few metres) instead of postcode-centroid (~100m).
Open Government Licence v3.0 / OS Open Data Licence · source
HM Land Registry
INSPIRE polygons, Price Paid Data, CCOD (UK corporate ownership), OCOD (overseas corporate ownership). We reconcile the schedule's stated ownership against HMLR; material misalignment surfaces as a Concern.
Open Government Licence v3.0 · source
Valuation Office Agency (VOA)
Non-Domestic Rating List: rateable value, description, SCAT code, address, effective date for every commercial hereditament in England & Wales (~2m rows). Second under-insurance signal and use-class verification on commercial property risks.
Open Government Licence v3.0 · source
planning.data.gov.uk
Article 4 directions, Tree Preservation Zones, Flood Risk Zones, AONBs, Green Belt, Ancient Woodland, and recent planning applications keyed to the site.
Open Government Licence v3.0 · source
OpenStreetMap
Building footprint in m², plus what's within 100m: petrol stations, industrial use, neighbouring building uses. Useful to sanity-check EPC sqm and surface fire-spread exposure.
ODbL 1.0 — © OpenStreetMap contributors · source