AddressBase Products January 2026 – Epoch 124

This release note provides information about the January 2026 Epoch 124 release of the AddressBase products. These products were released to customers on 06 January 2026.

Record counts

Product	Full Supply Record Count	Change-Only Update Record Count
OS Open UPRN	41 ,431 031	N/A
AddressBase	30 845 902	129 661
AddressBase Plus	38 624 958	637 192
AddressBase Premium	See rows below	See rows below
Street	1 523 057	6 933
Street Descriptor	1 647 240	4 473
BLPU	41 431 031	401 527
Classification	45 224 829	166 474
LPI	46 754 671	161 905
Organisation	1 386 792	12 722
Delivery Point Address	30 960 300	62 734
Application Cross Ref.	200 459 799	714 652
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	30 845 902	30 845 901	1
AddressBase Plus	38 624 958	38 624 931	27
AddressBase Premium	See rows below	See rows below	See rows below
Street	1 523 057	1 523 054	3
Street Descriptor	1 647 240	1 647 237	3
BLPU	41 431 031	41 431 001	30
Classification	45 224 829	45 224 797	32
LPI	46 754 671	46 754 640	31
Organisation	1 386 792	1 386 790	2
Delivery Point Address	30 960 300	30 960 299	1
Application Cross Ref.	200 459 799	200 459 768	31
Successor	0	0	0

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.

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	34 765
Updates	84 466
Deletes	10 430
COU Populated Tile Count	5 401

AddressBase Plus

Change Type	Count
Inserts	57 650
Updates	566 160
Deletes	13 382
COU Populated Tile Count	7 279

AddressBase Premium

AddressBase Premium Table	Inserts	Updates	Deletes
Street	1 962	4 932	39
Street Descriptor	1 999	2 434	40
BLPU	48 087	349 834	3 606
Classification	58 348	88 700	19 426
LPI	61 868	95 510	4 527
Organisation	4 048	4 478	4 246
Delivery Point Address	35 162	17 314	10 258
Application Cross Ref.	213 522	466 630	34 500

Source data currency

The following information relates to the currency of the source data used in the creation of Epoch 124:

Data Source	Date
Royal Mail PAF	04 December 2025
National Land and Property Gazetteer	04 December 2025
One Scotland Gazetteer	17 November 2025
VOA Non-Domestic Rates	01 December 2025
VOA Council Tax	01 December 2025
OS MasterMap Topography Layer	02 December 2025
OS MasterMap Highways Network	04 December 2025
Code-Point with Polygons	01 October 2025
Boundary-Line	02 October 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, Service Disruptions and Planned Maintenance page. This page will provide details of their impacts and updates on the expected time frame for their resolution.

Improvements in Epoch 124

Valuation Office Agency matching

The match rates for Council Tax and Non-Domestic Rates for Epoch 124 are detailed as follows based on Valuation Office Agency (VOA) records up to 04 December 2025 . The match rate is applicable to the AddressBase Premium product.

Data Source	Records Received	% Matched
Council Tax	27 363 655	99.2
Non-Domestic Rates	2 122 323	96.47

Next release

The next release of AddressBase products, Epoch 125, is scheduled for 19 February 2026