Hi,
I notice that at least one post office has been added at a post code centroid (Bwlch), which in rural Wales will inevitably be likely to be misleading. I know the PO Branches are usually more accurately located, but I think some cross-checking is needed (e.g., vs the 2 OS map layers or hints from FHRS or Geograph). I've merged this one with the Gate Shop node (as clearly the post office in the shop), but the others may need re-verifying.
Jerry