This release note provides information about the release of the AddressBase Core product on 20 January 2026.
Record counts
Product
Full Supply Record Count
Change-Only Update Record Count
AddressBase Core
34 834 977
40 658
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.
Product
MGBS Full Count
National 5km Tiled Supply
Difference
AddressBase Core
34 834 977
34 834 963
14
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:
Change Type
Count
Inserts
9 209
Updates
28 885
Deletes
2 564
COU populated 5km tile count
3 262
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:
Data Source
Date
Royal Mail Postcode Address File (PAF)
15 January 2026
National Land and Property Gazetteer
15 January 2026
One Scotland Gazetteer
04 January 2026
OS MasterMap Topography Layer
11 December 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.
