AddressBase Products October 2025 – Epoch 122

This release note provides information about the October 2025 (Epoch 122) release of the AddressBase products. These products were released to customers on 16 October 2025.

Record counts

Product	Full Supply Record Count	Change-Only Update Record Count
OS Open UPRN	41 348 033	N/A
AddressBase	30 801 406	129 609
AddressBase Plus	38 538 480	583 698
AddressBase Premium	See rows below	See rows below
Street	1 519 786	3 535
Street Descriptor	1 643 901	1 715
BLPU	41 348 033	446 875
Classification	45 153 073	112 212
LPI	46 647 756	109 748
Organisation	1 387 389	18 623
Delivery Point Address	30 914 419	43 569
Application Cross Ref.	200 127 309	468 449
Successor	0	0

Please note:

• The Full Supply record counts are based on a Managed Great Britain Set (MGBS). If you have ordered your national coverage via the online ordering system using a polygon outline, then your counts may differ.

• Change-Only Updates (COUs) are not available for the OS Open UPRN product.

Product supply comparison

There is a difference in product counts between taking a national Managed Great Britain Set (MGBS) and a national Area of Interest (AOI). This is because the two supplies use different selection criteria. The differences are shown in the following table, allowing for you to validate your data holdings once you have loaded the latest release of AddressBase data.

The national AOI refers to the pre-selection GB polygon from our download store. Therefore, if you have drawn your own AOI, the count will vary.

If you are unsure of your supply type, please check this with your OS Relationship Manager.

Product	MGBS Full Count	National AOI Full Count	Difference
AddressBase	30 801 406	30 801 406	0
AddressBase Plus	38 538 480	38 538 455	25
AddressBase Premium	See rows below	See rows below	See rows below
Street	1 519 786	1 519 783	3
Street Descriptor	1 643 901	1 643 898	3
BLPU	41 348 033	41 348 003	30
Classification	45 153 073	45 153 041	32
LPI	46 647 756	46 647 725	31
Organisation	1 387 389	1 387 387	2
Delivery Point Address	30 914 419	30 914 419	0
Application Cross Ref.	200 127 309	200 127 278	31
Successor	0	0	0

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.

Changed records

If you receive a Change-Only Update (COU) supply for your AddressBase product, you will receive Insert, Update and Delete records within the supplied file. The following tables detail the numbers of these records which can be expected in an MGBS supply, and also how many tiles are affected if you take your supply as Changed Chunks.

AddressBase

Change Type	Count
Inserts	27 357
Updates	95 524
Deletes	6 728
COU Populated Tile Count	9 395

AddressBase Plus

Change Type	Count
Inserts	42 865
Updates	531 846
Deletes	8 987
COU Populated Tile Count	10 343

AddressBase Premium

AddressBase Premium Table	Inserts	Updates	Deletes
Street	911	2 548	76
Street Descriptor	955	682	78
BLPU	31 114	413 889	1 872
Classification	39 431	58 873	13 908
LPI	40 960	66 500	2 288
Organisation	3 114	2 847	12 662
Delivery Point Address	27 650	9 512	6 407
Application Cross Ref.	187 411	260 020	21 018

Source data currency

The following information relates to the currency of the source data used in the creation of Epoch 122:

Data Source	Date
Royal Mail PAF	11 September 2025
National Land and Property Gazetteer	11 September 2025
One Scotland Gazetteer	01 September 2025
VOA Non-Domestic Rates	11 September 2025
VOA Council Tax	11 September 2025
OS MasterMap Topography Layer	14 August 2025
OS MasterMap Highways Network	04 September 2025
Code-Point with Polygons	01 July 2025
Boundary-Line	01 May 2025

Data issues

AddressBase

Details of live and resolved data issues for AddressBase will be communicated on the AddressBase Known Data Issues page. This page will provide details of their impacts and updates on the expected time frame for their resolution.

AddressBase Plus issues

Details of live and resolved data issues for AddressBase Plus will be communicated on the AddressBase Plus Known Data Issues page. This page will provide details of their impacts and updates on the expected time frame for their resolution.

AddressBase Premium

Details of live and resolved data issues for AddressBase Premium will be communicated on the AddressBase Premium Known Data Issues page. This page will provide details of their impacts and updates on the expected time frame for their resolution.

Improvements in Epoch 122

Valuation Office Agency matching

The match rates for Council Tax and Non-Domestic Rates for Epoch 122 are detailed as follows based on Valuation Office Agency (VOA) records up to 08 September 2025. The match rate is applicable to the AddressBase Premium product.

Data Source	Records Received	% Matched
Council Tax	27 312 781	99.92
Non-Domestic Rates	2 121 813	96.5

Next release

The next release of AddressBase products, Epoch 123, is scheduled for 27 November 2025.