May 2026 – Epoch 52

This release note provides information about the May 2026 release of OS Open TOID (Epoch 52).

Feature counts

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

Product	Source Product	CSV	GeoPackage
OS MasterMap Sites Layer	49 347	49 347	49 347
OS MasterMap Highways Network	21 034 002	21 034 002	21 034 002
OS MasterMap Topography Layer	491 435 436	491 435 436	491 435 436
Total	512 518 785	512 518 785	512 518 785

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 53), is scheduled for 29 June 2026.