# AddressBase Products April 2026 – Epoch 126 ## Record counts | Product | Full Supply Record Count | Change-Only Update Record Count | | ---------------------- | ------------------------ | ------------------------------- | | OS Open UPRN | 41 507 361 | N/A | | AddressBase | 30 897 890 | 138 295 | | AddressBase Plus | 38 706 709 | 733 300 | | AddressBase Premium | See rows below | See rows below | | Street | 1 525 007 | 16 118 | | Street Descriptor | 1 649 294 | 2 502 | | BLPU | 41 507 361 | 655 949 | | Classification | 45 294 152 | 165 924 | | LPI | 46 855 437 | 175 454 | | Organisation | 1 386 364 | 14 108 | | Delivery Point Address | 31 012 899 | 63 989 | | Application Cross Ref. | 200 774 465 | 620 825 | | 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 | 30 897 890 | 30 897 889 | 1 | | AddressBase Plus | 38 706 709 | 38 706 682 | 27 | | AddressBase Premium | See rows below | See rows below | See rows below | | Street | 1 525 007 | 1 525 004 | 3 | | Street Descriptor | 1 649 294 | 1 649 291 | 3 | | BLPU | 41 507 361 | 41 507 331 | 30 | | Classification | 45 294 152 | 45 294 120 | 32 | | LPI | 46 855 437 | 46 855 406 | 31 | | Organisation | 1 386 364 | 1 386 362 | 2 | | Delivery Point Address | 31 012 899 | 31 012 898 | 1 | | Application Cross Ref. | 200 774 465 | 200 774 434 | 31 | | 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](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/addressbase/addressbase-getting-started-guide/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 | 34 944 | | Updates | 92 168 | | Deletes | 11 183 | | COU Populated Tile Count | 5 198 | ### AddressBase Plus | Change Type | Count | | ------------------------ | ------- | | Inserts | 55 006 | | Updates | 671 373 | | Deletes | 13 152 | | COU Populated Tile Count | 7 080 | ### AddressBase Premium | AddressBase Premium Table | Inserts | Updates | Deletes | | ------------------------- | ------- | ------- | ------- | | Street | 1 068 | 14 989 | 61 | | Street Descriptor | 1 107 | 1 331 | 64 | | BLPU | 45 018 | 607 147 | 3 784 | | Classification | 56 866 | 87 934 | 21 124 | | LPI | 57 671 | 112 787 | 4 996 | | Organisation | 4 349 | 5 194 | 4 565 | | Delivery Point Address | 35 532 | 17 075 | 11 382 | | Application Cross Ref. | 205 091 | 379 576 | 36 158 | ## Source data currency The following information relates to the currency of the source data used in the creation of Epoch **126**: | Data Source | Date | | ------------------------------------ | ---------------- | | Royal Mail PAF | 26 February 2026 | | National Land and Property Gazetteer | 26 February 2026 | | One Scotland Gazetteer | 08 February 2026 | | VOA Non-Domestic Rates | 24 February 2026 | | VOA Council Tax | 24 February 2026 | | OS MasterMap Topography Layer | 17 February 2026 | | OS MasterMap Highways Network | 05 February 2026 | | Code-Point with Polygons | 02 January 2026 | | 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](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, Service Disruptions and Planned Maintenance 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 126 ### Valuation Office Agency matching The match rates for Council Tax and Non-Domestic Rates for Epoch 126 are detailed as follows based on Valuation Office Agency (VOA) records up to **24 February 2026.** The match rate is applicable to the AddressBase Premium product. | Data Source | Records Received | % Matched | | ------------------ | ---------------- | --------- | | Council Tax | 27 423 462 | 99.89 | | Non-Domestic Rates | 2 125 966 | 96.44 | ### Tertiary classifications Work is being undertaken to improve the classifications of records within the AddressBase products. This work has resulted in **45 684** more tertiary classifications present in Epoch **126** compared to Epoch **125**. Indeed, **87.99 %** of these tertiary classification improvements are against residential codes. ## Next release The next release of AddressBase products, Epoch **127**, is scheduled for **14 May 2026**.