# AddressBase Products November 2025 – Epoch 123 ## Record counts | Product | Full Supply Record Count | Change-Only Update Record Count | | ---------------------- | ------------------------ | ------------------------------- | | OS Open UPRN | 41 386 550 | N/A | | AddressBase | 30 821 567 | 131 373 | | AddressBase Plus | 38 580 690 | 632 773 | | AddressBase Premium | See rows below | See rows below | | Street | 1 521 134 | 21 137 | | Street Descriptor | 1 645 281 | 2 669 | | BLPU | 41 386 550 | 494 886 | | Classification | 45 185 907 | 183 823 | | LPI | 46 697 330 | 207 444 | | Organisation | 1 386 990 | 14 848 | | Delivery Point Address | 30 935 396 | 59 171 | | Application Cross Ref. | 200 280 777 | 679 795 | | 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 | 30 821 567 | 30 821 566 | 1 | | AddressBase Plus | 38 580 690 | 38 580 664 | 26 | | AddressBase Premium | See rows below | See rows below | See rows below | | Street | 1 521 134 | 1 521 131 | 3 | | Street Descriptor | 1 645 281 | 1 645 278 | 3 | | BLPU | 41 386 550 | 41 386 519 | 31 | | Classification | 45 185 907 | 45 185 874 | 33 | | LPI | 46 697 330 | 46 697 298 | 32 | | Organisation | 1 386 990 | 1 386 988 | 2 | | Delivery Point Address | 30 935 396 | 30 935 395 | 1 | | Application Cross Ref. | 200 280 777 | 200 280 745 | 32 | | Successor | 0 | 0 | 0 | It is important that COUs are processed with Deletes first, then Inserts and Updates. This is to ensure that updates are applied in the correct order. Guidance on this can be found in the '[Working with COU data' page in the AddressBase Core Getting Started Guide](/os-downloads/products/addresses-and-names-portfolio/addressbase-core/addressbase-core-getting-started-guide/working-with-cou-data.md). ## 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 | 31 370 | | Updates | 88 794 | | Deletes | 11 209 | | COU Populated Tile Count | 5 260 | ### AddressBase Plus | Change Type | Count | | ------------------------ | ------- | | Inserts | 57 974 | | Updates | 559 035 | | Deletes | 15 764 | | COU Populated Tile Count | 7 287 | ### AddressBase Premium | AddressBase Premium Table | Inserts | Updates | Deletes | | ------------------------- | ------- | ------- | ------- | | Street | 1 398 | 19 689 | 50 | | Street Descriptor | 1 430 | 1 189 | 50 | | BLPU | 42 394 | 448 615 | 3 877 | | Classification | 54 370 | 107 917 | 21 536 | | LPI | 54 146 | 148 726 | 4 572 | | Organisation | 4 303 | 5 843 | 4 702 | | Delivery Point Address | 32 165 | 15 818 | 11 188 | | Application Cross Ref. | 215 860 | 401 543 | 62 392 | ## Source data currency The following information relates to the currency of the source data used in the creation of Epoch 123: | Data Source | Date | | ------------------------------------ | --------------- | | Royal Mail PAF | 23 October 2025 | | National Land and Property Gazetteer | 23 October 2025 | | One Scotland Gazetteer | 06 October 2025 | | VOA Non-Domestic Rates | 23 October 2025 | | VOA Council Tax | 23 October 2025 | | OS MasterMap Topography Layer | 14 October 2025 | | OS MasterMap Highways Network | 06 October 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](/os-downloads/products/addresses-and-names-portfolio/addressbase/addressbase-known-data-issues.md). 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](/os-downloads/products/addresses-and-names-portfolio/addressbase-plus/addressbase-plus-known-data-issues.md). 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](/os-downloads/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-known-data-issues-service-disruptions-and-planned-maintenance.md). This page will provide details of their impacts and updates on the expected time frame for their resolution. ## Improvements in Epoch 123 ### Valuation Office Agency matching The match rates for Council Tax and Non-Domestic Rates for Epoch 123 are detailed as follows based on Valuation Office Agency (VOA) records up to 23 October 2025. The match rate is applicable to the AddressBase Premium product. | Data Source | Records Received | % Matched | | ------------------ | ---------------- | --------- | | Council Tax | 27 338 190 | 99.90 | | Non-Domestic Rates | 2 124 934 | 96.35 | ## Next release The next release of AddressBase products, Epoch 124, is scheduled for **08 January 2026** --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-fundamentals/release-notes/addressbase-products-november-2025-epoch-123.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.