March 2026 – Epoch 51

This release note provides information about the March 2026 release of OS Open TOID (Epoch 51).

Feature counts

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

Product	Source Product	CSV	GeoPackage
OS MasterMap Sites Layer	49 197	49 197	49 197
OS MasterMap Highways Network	21 000 301	21 000 301	21 000 301
OS MasterMap Topography Layer	491 041 738	491 041 738	491 041 738
Total	512 091 236	512 091 236	512 091 236

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

Next release

The next release of OS Open TOID (Epoch 52), is scheduled for 11 May 2026.