AddressBase Products May 2025 – Epoch 118

This release note provides information about the May 2025 (Epoch 118) release of the AddressBase products. These products were released to customers on 01 May 2025.

Object Without Postal Address (OWPA) enhancement in Epoch 118 for AddressBase Premium and AddressBase Plus

There is a small uplift in this release of both AddressBase Premium and AddressBase Plus due to an improvement in the Object Without Postal Address (OWPA) features contained within these two products. As a result of this uplift, COU counts are around 30% larger, in comparison to the 3 previous releases. This may result in slower processing times.

Record counts

Product	Full Supply Record Count	Change-Only Update Record Count
OS Open UPRN	41 196 104	N/A
AddressBase	30 705 430	152 191
AddressBase Plus	38 390 448	1 085 737
AddressBase Premium	See rows below	See rows below
Street	1 515 628	4 732
Street Descriptor	1 639 498	3 233
BLPU	41 196 104	790 039
Classification	45 017 696	446 122
LPI	46 450 006	620 587
Organisation	1 398 046	19 314
Delivery Point Address	30 816 296	64 760
Application Cross Ref.	199 441 353	1 235 928
Successor	0	0

• 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.

• Please note that 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	30 705 430	30 705 430	0
AddressBase Plus	38 390 448	38 390 426	22
AddressBase Premium	See rows below	See rows below	See rows below
Street	1 515 628	1 515 625	3
Street Descriptor	1 639 498	1 639 495	3
BLPU	41 196 104	41 196 078	26
Classification	45 017 696	45 017 670	4
LPI	46 450 006	46 449 979	27
Organisation	1 398 046	1 398 044	2
Delivery Point Address	30 816 296	30 816 296	0
Application Cross Ref.	199 441 353	199 441 327	26
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	39 607
Updates	103 385
Deletes	9 199
COU Populated Tile Count	5 450

AddressBase Plus

Change Type	Count
Inserts	146 606
Updates	896 728
Deletes	42 403
COU Populated Tile Count	8 520

AddressBase Premium

AddressBase Premium Table	Inserts	Updates	Deletes
Street	1 524	3 177	31
Street Descriptor	1 572	1 627	34
BLPU	146 717	640 377	2 945
Classification	172 147	242 226	31 749
LPI	168 697	448 093	3 797
Organisation	5 785	5 762	7 767
Delivery Point Address	40 444	14 910	9 406
Application Cross Ref.	564 892	636 931	34 105

Source data currency

The following information relates to the currency of the source data used in the creation of Epoch 118:

Data Source	Date
Royal Mail PAF	27 March 2025
National Land and Property Gazetteer	27 March 2025
One Scotland Gazetteer	10 March 2025
VOA Non-Domestic Rates	25 March 2025
VOA Council Tax	25 March 2025
OS MasterMap Topography Layer	27 February 2025
OS MasterMap Highways Network	07 March 2025
Code-Point with Polygons	02 January 2025
Boundary-Line	02 October 2024

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 118

Valuation Office Agency matching

The match rates for Council Tax and Non-Domestic Rates for Epoch Epoch 118 are detailed as follows based on Valuation Office Agency (VOA) records up to 25 March 2025. The match rate is applicable to the AddressBase Premium product.

Data Source	Records Received	% Matched
Council Tax	27 251 204	99.91
Non-Domestic Rates	2 120 750	96.46

Next release

The next release of AddressBase products, Epoch 119, is scheduled for 12 June 2025.