02 September 2025
This release note provides information about the release of the AddressBase Core product on 02 September 2025.
Record counts
AddressBase Core
34 725 357
33 835
Please note that the Full Supply record count is based on a Managed Great Britain Set (MGBS). If you ordered your national coverage via the online ordering system using a polygon outline, your counts may differ.
Product supply comparison
There is a difference in record counts between taking a national Managed Great Britain Set (MGBS) and the national 5km-tile supply. This is because the two supplies use different selection criteria. The difference in record counts is shown in the following table, allowing you to validate your data holdings once you have loaded the latest release of AddressBase Core.
AddressBase Core
34 725 357
34 725 345
12
A small difference in record counts is expected due to there being several features supplied in the MGBS which fall outside of the tiled area.
Changed records
If you receive a Change-Only Update (COU) supply for your AddressBase Core product, you will receive Insert, Update and Delete records within the supplied file. The following table details the numbers of these records which can be expected in the COU supply of the product:
Inserts
6 638
Updates
25 387
Deletes
1 810
COU populated 5km tile count
2 644
It's important that COUs are processed with Deletes first, then Inserts and Updates. This is to ensure that updates are applied in the correct order. Further guidance on this can be found in 'Working with COU data' in the AddressBase Getting Started Guide.
Source data currency
The following information relates to the currency of the source data used in the creation of this release of AddressBase Core:
Royal Mail Postcode Address File (PAF)
29 August 2025
National Land and Property Gazetteer
29 August 2025
One Scotland Gazetteer
27 August 2025
OS MasterMap Topography Layer
22 May 2025
Known data issues
Details of data issues, service disruptions and planned maintenance for AddressBase Core will be communicated on the AddressBase Core Data Issues, Service Disruption and Planned Maintenance page; this page will provide details of the impacts of any data issues, plus updates on the expected time frame for resolution.
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