14 January 2025

This release note provides information about the release of the AddressBase Core product on 14 January 2025.

Record counts

Product	Full Supply record count	Change-Only Update record count
AddressBase Core	34 568 929	63 177

These counts are 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	34 568 929	34 568 922	7

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	6 644
Updates	54 392
Deletes	2 141
COU populated 5km tile count	2 983

It is important that COUs are processed with Deletes first, then Inserts and Updates. This is to ensure that updates are applied in the correct order. Guidance on this can be found in the 'Working with COU data' page in the AddressBase Core 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)	10 January 2025
National Land and Property Gazetteer	10 January 2025
One Scotland Gazetteer	09 December 2024
OS MasterMap Topography Layer	28 November 2024