AddressBase Products August 2026 – Epoch 129

This release note provides information about the August (Epoch 129) release of the AddressBase products. These products were released to customers on 06 August 2026.

Record counts

Product	Full Supply Record Count	Change-Only Update Record Count
OS Open UPRN	41 593 225	N/A
AddressBase	30 975 358	130 146
AddressBase Plus	38 820 690	1 011 076
AddressBase Premium	See rows below	See rows below
Street	1 531 486	11 812
Street Descriptor	1 655 900	6 934
BLPU	41 629 393	915 753
Classification	45 392 944	313 767
LPI	47 013 294	155 218
Organisation	1 389 950	12 779
Delivery Point Address	31 092 078	55 541
Application Cross Ref.	201 497 278	639 897
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	30 975 358	30 975 357	1
AddressBase Plus	38 820 690	38 820 665	25
AddressBase Premium	See rows below	See rows below	See rows below
Street	1 531 486	1 531 484	2
Street Descriptor	1 655 900	1 655 898	2
BLPU	41 629 393	41 629 366	27
Classification	45 392 944	45 392 917	27
LPI	47 013 294	47 013 266	28
Organisation	1 389 950	1 389 948	2
Delivery Point Address	31 092 078	31 092 078	0
Application Cross Ref.	201 497 278	201 497 251	27
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	31 528
Updates	90 136
Deletes	8 482
COU Populated Tile Count	5 289

AddressBase Plus

Change Type	Count
Inserts	46 421
Updates	949 822
Deletes	14 833
COU Populated Tile Count	7 334

AddressBase Premium

AddressBase Premium Table	Inserts	Updates	Deletes
Street	1 313	10 254	245
Street Descriptor	1 357	5 322	245
BLPU	39 354	873 213	3 186
Classification	83 420	162 568	67 779
LPI	52 006	98 975	4 237
Organisation	4 268	4 245	4 266
Delivery Point Address	31 906	15 324	8 311
Application Cross Ref.	193 742	383 548	62 607

Source data currency

The following information relates to the currency of the source data used in the creation of Epoch 129:

Data Source	Date
Royal Mail PAF	02 July 2026
National Land and Property Gazetteer	02 July 2026
One Scotland Gazetteer	02 July 2026
VOA Non-Domestic Rates	01 July 2026
VOA Council Tax	01 July 2026
OS MasterMap Topography Layer	22 June 2026
OS MasterMap Highways Network	03 June 2026
Code-Point with Polygons	01 July 2026
Boundary-Line	01 May 2026

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 129

Valuation Office Agency matching

The match rates for Council Tax and Non-Domestic Rates for Epoch 129 are detailed as follows based on Valuation Office Agency (VOA) records up to 01 July 2026. The match rate is applicable to the AddressBase Premium product.

Data Source	Records Received	% Matched
Council Tax	27 483 969	99.99
Non-Domestic Rates	2 121 123	96.52

Next release

The next release of AddressBase products, Epoch 130, is scheduled for 17 September 2026.