August 2025 – Epoch 45

This release note provides information about the August 2025 release of OS Open TOID (Epoch 45).

Feature counts

Feature counts for this release are provided in the following table:

Product	Source Product	CSV	GeoPackage
OS MasterMap Sites Layer	49 076	49 076	49 076
OS MasterMap Highways Network	20 811 243	20 811 243	20 811 243
OS MasterMap Topography Layer	487 941 849	487 941 849	487 941 849
Total	508 802 168	508 802 168	508 802 168

There are no missing features and no duplicated TOIDs in this release. No significant errors have been identified.

In this release, the tile ‘NW’ was found to be noticeably larger than the previous release (~5% larger) in both CSV and GPKG formats. OS data improvement work in the area on a small number of transport features has caused a larger than usual percentage change. This is expected, as the tile 'NW' only includes a small area of land around The Rhins of Galloway in South Western Scotland, and most of the tile is sea.

Next release

The next release of OS Open TOID (Epoch 45), is scheduled for 15 September 2025.