Second Look AdvisoryIndependent review
14 — Data sources

Data sources and attribution

Last updated 24 October 2026

1. Sources we use

Planning Data (planning.data.gov.uk)

Publisher
Ministry of Housing, Communities and Local Government (MHCLG)
Used for
National planning designations in England: Conservation Areas, Article 4 Directions, Green Belt, National Parks, AONB, Tree Preservation Orders and local authority boundaries.
Licence
Open Government Licence v3.0
Credit
Designations © MHCLG, Open Government Licence v3.0.

National Heritage List for England

Publisher
Historic England
Used for
Listed buildings and scheduled monuments.
Licence
Open Government Licence v3.0
Credit
[credit line]

Ancient Woodland Inventory

Publisher
Natural England
Used for
Ancient woodland near the location.
Licence
Open Government Licence v3.0
Credit
[credit line]

OS Maps API

Publisher
Ordnance Survey
Used for
Background mapping on First Check maps.
Licence
OS licence terms
Credit
Contains OS data © Crown copyright and database right

INSPIRE Index Polygons

Publisher
HM Land Registry
Used for
Indicative registered-title extents on the land boundaries map layer.
Licence
Open Government Licence v3.0
Credit
Contains HM Land Registry INSPIRE Index Polygon data © Crown copyright and database right.

Coalfield Consultation Areas

Publisher
Mining Remediation Authority
Used for
Whether a location sits in a coal mining reporting area.
Licence
Open Government Licence v3.0
Credit
[credit line]

Indicative Atlas of Radon, version 3

Publisher
UK Health Security Agency (UKHSA) and British Geological Survey (BGS)
Used for
Radon potential band for the 1 km grid square.
Licence
Open Government Licence v3.0
Credit
[credit line]

postcodes.io

Publisher
Ideal Postcodes, using ONS and OS open data
Used for
Turning a postcode or place name into a location.
Licence
[licence]
Credit
[credit line]

Connected Nations API

Publisher
Ofcom
Used for
Indicative broadband speed and mobile coverage per postcode.
Licence
[licence]
Credit
[credit line]

PVGIS

Publisher
European Commission Joint Research Centre
Used for
Ceiling estimate of solar yield for an ideal roof.
Licence
[licence]
Credit
[credit line]

Railway station locations

Publisher
[publisher]
Used for
Nearest railway station, straight-line distance.
Licence
[licence]
Credit
[credit line]

2. Know the limits

  • Datasets can be incomplete or out of date.
  • Council-supplied layers vary by area.
  • Boundaries are indicative.
  • Always confirm with primary sources and professional searches.