Finding UK-only SNOMED CT codes subset?

I’m looking for the data source that powers the UK SNOMED-CT browser (view here).

I’ve downloaded the International SNOMED CT (SNOMED CT International Edition) codes from TRUD, but only a subset of these codes (i.e. UK SNOMED CT) is valid for use in the UK. Furthermore, I think these are denoted by the active property on the UK SNOMED-CT browser.

I also tried downloading SNOMED CT UK Clinical Edition from TRUD, but the description files seem to be too small.

Any ideas on a concrete way to obtain UK-valid SNOMED CT concepts in bulk?

Should be pulling from the UK Clinical Edition, this should be SNOMEDCT2_41.0.0_20250924000001 to the best of my understanding, is this the edition you are looking at? Could you have the RF2 Delta release instead which only contains the changes.

I’ve not looked at this in years but don’t you need to import the international first and then add UK to it?

The source for the NHS SNOMED CT Browser is the ‘SNOMED CT UK Monolith Edition, RF2: Snapshot’.

This release contains the relevant SNOMED CT Internatonal Edition, the SNOMED CT UK clinical extension and the SNOMED CT UK drug extension.

Each release of this item contains an integrated, fully merged set of the SNOMED CT UK Clinical Extension, the UK Drug Extension, the UK Pathology Extension and the International Edition, as a single set of files in Release Format 2 (RF2).

The merged tables are post-processed to resolve duplicates and conflicts that can occur when separate snapshots are combined.