# AddressBase Products September 2025 – Epoch 121 ## Record counts | Product | Full Supply Record Count | Change-Only Update Record Count | | ---------------------- | ------------------------ | ------------------------------- | | OS Open UPRN | 41 270 485 | N/A | | AddressBase | 30 780 777 | 190 178 | | AddressBase Plus | 38 504 602 | 747 079 | | AddressBase Premium | See rows below | See rows below | | Street | 1 518 951 | 6 979 | | Street Descriptor | 1 643 024 | 3 566 | | BLPU | 41 318 791 | 497 400 | | Classification | 45 127 550 | 186 102 | | LPI | 46 609 084 | 196 818 | | Organisation | 1 396 937 | 21 750 | | Delivery Point Address | 30 893 176 | 81 996 | | Application Cross Ref. | 199 960 916 | 1 028 132 | | Successor | 0 | 0 | {% hint style="info" %} * 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. {% endhint %} ## 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 | 30 780 777 | 30 780 777 | 0 | | AddressBase Plus | 38 504 602 | 38 504 577 | 25 | | AddressBase Premium | See rows below | See rows below | See rows below | | Street | 1 518 951 | 1 518 948 | 3 | | Street Descriptor | 1 643 024 | 1 643 021 | 3 | | BLPU | 41 318 791 | 41 318 761 | 30 | | Classification | 45 127 550 | 45 127 518 | 22 | | LPI | 46 609 084 | 46 609 053 | 31 | | Organisation | 1 396 937 | 1 396 935 | 2 | | Delivery Point Address | 30 893 176 | 30 893 176 | 0 | | Application Cross Ref. | 199 960 916 | 199 960 885 | 31 | | 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](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-core/addressbase-core-getting-started-guide/working-with-cou-data). ## 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 | 49 044 | | Updates | 131 238 | | Deletes | 9 896 | | COU Populated Tile Count | 5 351 | ### AddressBase Plus | Change Type | Count | | ------------------------ | ------- | | Inserts | 67 012 | | Updates | 665 372 | | Deletes | 14 695 | | COU Populated Tile Count | 7 259 | ### AddressBase Premium | AddressBase Premium Table | Inserts | Updates | Deletes | | ------------------------- | ------- | ------- | ------- | | Street | 1 241 | 5 726 | 12 | | Street Descriptor | 1 321 | 2 233 | 12 | | BLPU | 50 956 | 443 794 | 2 650 | | Classification | 65 969 | 95 869 | 24 264 | | LPI | 68 758 | 123 806 | 4 254 | | Organisation | 6 401 | 8 820 | 6 529 | | Delivery Point Address | 49 531 | 22 842 | 9 623 | | Application Cross Ref. | 227 695 | 720 867 | 79 570 | ## Source data currency The following information relates to the currency of the source data used in the creation of Epoch 121: | Data Source | Date | | ------------------------------------ | -------------- | | Royal Mail PAF | 07 August 2025 | | National Land and Property Gazetteer | 07 August 2025 | | One Scotland Gazetteer | 14 July 2025 | | VOA Non-Domestic Rates | 05 July 2025 | | VOA Council Tax | 05 July 2025 | | OS MasterMap Topography Layer | 10 July 2025 | | OS MasterMap Highways Network | 07 August 2025 | | Code-Point with Polygons | 01 July 2025 | | Boundary-Line | 01 May 2025 | ## Data issues ### AddressBase Details of live and resolved data issues for AddressBase will be communicated on the [AddressBase Known Data Issues page](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase/addressbase-known-data-issues). 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](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-plus/addressbase-plus-known-data-issues). 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](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase-premium/addressbase-premium-known-data-issues-service-disruptions-and-planned-maintenance). This page will provide details of their impacts and updates on the expected time frame for their resolution. ## Improvements in Epoch 121 ### Valuation Office Agency matching The match rates for Council Tax and Non-Domestic Rates for Epoch 121 are detailed as follows based on Valuation Office Agency (VOA) records up to 28 July 2025. The match rate is applicable to the AddressBase Premium product. | Data Source | Records Received | % Matched | | ------------------ | ---------------- | --------- | | Council Tax | 27 246 694 | 99.91 | | Non-Domestic Rates | 2 122 283 | 96.43 | ## Next release The next release of AddressBase products, Epoch 122, is scheduled for **16 October 2025**.