AddressBase Products March 2025 – Epoch 117

This release note provides information about the March 2025 Epoch 117 release of the AddressBase products. These products were released to customers on 20 March 2025.

Record counts

Product	Full Supply Record Count	Change-Only Update Record Count
OS Open UPRN	41 052 332	N/A
AddressBase	30 675 022	138 394
AddressBase Plus	38 286 245	721 346
AddressBase Premium	See rows below	See rows below
Street	1 514 135	4 127
Street Descriptor	1 637 960	4 765
BLPU	41 052 332	348 127
Classification	44 877 298	198 513
LPI	46 285 106	149 761
Organisation	1 400 028	27 007
Delivery Point Address	30 785 258	57 204
Application Cross Ref.	198 910 566	717 312
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	30 675 022	30 675 022	0
AddressBase Plus	38 286 245	38 286 223	22
AddressBase Premium	See rows below	See rows below	See rows below
Street	1 514 135	1 514 132	3
Street Descriptor	1 637 960	1 637 957	3
BLPU	41 052 332	41 052 306	26
Classification	44 877 298	44 877 272	26
LPI	46 285 106	46 285 079	27
Organisation	1 400 028	1 400 026	2
Delivery Point Address	30 785 258	30 785 258	0
Application Cross Ref.	198 910 566	198 910 540	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	32 301
Updates	96 676
Deletes	9 417
COU Populated Tile Count	5 412

AddressBase Plus

Change Type	Count
Inserts	47 638
Updates	659 891
Deletes	13 817
COU Populated Tile Count	7 297

AddressBase Premium

AddressBase Premium Table	Inserts	Updates	Deletes
Street	1 071	3 031	25
Street Descriptor	1 114	3 616	35
BLPU	44 401	299 702	4 024
Classification	68 269	102 102	28 142
LPI	59 085	85 866	4 810
Organisation	5 710	8 051	13 246
Delivery Point Address	33 073	14 982	9 149
Application Cross Ref.	191 523	486 447	39 342

Source data currency

The following information relates to the currency of the source data used in the creation of Epoch 117:

Data Source	Date
Royal Mail PAF	13 February 2025
National Land and Property Gazetteer	13 February 2025
One Scotland Gazetteer	27 January 2025
VOA Non-Domestic Rates	10 February 2025
VOA Council Tax	10 February 2025
OS MasterMap Topography Layer	16 January 2025
OS MasterMap Highways Network	06 February 2025
Code-Point with Polygons	02 January 2025
Boundary-Line	02 October 2024

Data issues

AddressBase Plus issues

Affected output formats: CSV and GML

• There are 7 966 Unique Property Reference Numbers (UPRNs) which reference a Parent UPRN that cannot be found in the product. This is because the Parent UPRN is either provisional or historic and is not matched to the Royal Mail Postcode Address File (PAF) or Valuation Office Agency (VOA) record, meaning that it is not included in the AddressBase Plus product as per the existing background logic rules.

• There are 231 records with a sao_start_no or sao_text that have no Parent UPRN in the product. This is because the Parent UPRN is a historical record which is included as part of the logic for record inclusion in the AddressBase Plus products.

Improvements in Epoch 117

Valuation Office Agency matching

The match rates for Council Tax and Non-Domestic Rates for Epoch 117 are detailed as follows based on Valuation Office Agency (VOA) records up to 10 February 2025. The match rate is applicable to the AddressBase Premium product.

Data Source	Records Received	% Matched
Council Tax	27 247 539	99.9
Non-Domestic Rates	2 120 424	96.48

Tertiary classifications

Work is being undertaken to improve the classifications of records within the AddressBase products. This work has resulted in 69 348 more tertiary classifications present in Epoch 117 compared to Epoch 116. Indeed, 88.6 % of these tertiary classification improvements are against residential codes.

Next release

The next release of AddressBase products, Epoch 118, is scheduled for 01 May 2025.