21 January 2025

This release note provides information about the release of the AddressBase Core product on 21 January 2025.

Record counts

Product	Full Supply record count0F	Change-Only Update record count
AddressBase Core	34 573 091	38 721

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	34 573 091	34 573 083	8

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.

There is an additional feature in the 21/01/2025 release that is supplied in the MGBS dataset, but not in the National 5km Tiled supply. The feature details are as follows:

UPRN","CLASSIFICATION_CODE","LAST_UPDATE_DATE","SINGLE_LINE_ADDRESS","GSS_CODE"

130200314,"LD",2025-01-16 00:00:00,"LAND 57KM EAST OF SCOTTISH WATER TREATMENT WORKS, BROADHAVEN ROAD, WICK, KW1 5HA","S12000017"

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	7 882
Updates	27 119
Deletes	3 720
COU populated 5km tile count	3 712

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)	17 January 2025
National Land and Property Gazetteer	17 January 2025
One Scotland Gazetteer	06 January 2025
OS MasterMap Topography Layer	28 November 2024