AddressBase Products June 2026 – Epoch 128

This release note provides information about the June 2026 (Epoch 128) release of the AddressBase products. These products were released to customers on 25 June 2026.

Record counts

Product	Full Supply Record Count	Change-Only Update Record Count
OS Open UPRN	41 593 225	N/A
AddressBase	30 952 312	135 790
AddressBase Plus	38 789 102	4 167 563
AddressBase Premium	See rows below	See rows below
Street	1 530 418	8 576
Street Descriptor	1 654 788	5 398
BLPU	41 593 225	1 208 933
Classification	45 377 303	173 882
LPI	46 965 525	156 033
Organisation	1 389 948	15 603
Delivery Point Address	31 068 483	65 596
Application Cross Ref.	201 366 143	7 034 623
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	30 952 312	30 952 311	1
AddressBase Plus	38 789 102	38 789 076	26
AddressBase Premium	See rows below	See rows below	See rows below
Street	1 530 418	1 530 416	2
Street Descriptor	1 654 788	1 654 786	2
BLPU	41 593 225	41 593 196	29
Classification	45 377 303	45 377 272	31
LPI	46 965 525	46 965 495	30
Organisation	1 389 948	1 389 946	2
Delivery Point Address	31 068 483	31 068 482	1
Application Cross Ref.	201 366 143	201 366 113	30
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	38 340
Updates	86 943
Deletes	10 507
COU Populated Tile Count	5 284

AddressBase Plus

Change Type	Count
Inserts	59 013
Updates	4 094 953
Deletes	13 597
COU Populated Tile Count	7 102

AddressBase Premium

AddressBase Premium Table	Inserts	Updates	Deletes
Street	4 233	4 187	156
Street Descriptor	4 275	966	157
BLPU	50 042	1 155 592	3 299
Classification	60 594	96 900	16 388
LPI	63 478	88 525	4 030
Organisation	4 783	6 821	3 999
Delivery Point Address	38 725	16 379	10 492
Application Cross Ref.	3 561 768	333 594	3 139 261

Source data currency

The following information relates to the currency of the source data used in the creation of Epoch 128:

Data Source	Date
Royal Mail PAF	22 April 2026
National Land and Property Gazetteer	22 April 2026
One Scotland Gazetteer	21 May 2026
VOA Non-Domestic Rates	19 May 2026
VOA Council Tax	19 May 2026
OS MasterMap Topography Layer	12 May 2026
OS MasterMap Highways Network	08 May 2026
Code-Point with Polygons	01 April 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 128

Valuation Office Agency matching

The match rates for Council Tax and Non-Domestic Rates for Epoch 128 are detailed as follows based on Valuation Office Agency (VOA) records up to 19 May 2026. The match rate is applicable to the AddressBase Premium product.

Data Source	Records Received	% Matched
Council Tax	27 472 486	99.98
Non-Domestic Rates	2 131 965	96.52

Next release

The next release of AddressBase products, Epoch 129, is scheduled for 06 August 2026.

VOA Resync – Address data update (planned maintenance)

A VOA resynchronisation activity is being undertaken to correct and align address data, improving overall data currency and completeness. The update is expected to introduce a higher-than-normal volume of changes (~75,000 records), resulting in larger COU files for affected products.

The changes will be reflected in Epoch 129 for AddressBase Premium.

Customer impact

Customers should expect increased file sizes and a higher volume of change records in the relevant epoch; no service downtime is anticipated.