patrick, can't tell if you are joking or not. I know that some of my BBs have both US and UK sizes listed. I have a mix of firsts and seconds. I just checked a pair I happen to be wearing today and it has only the US listed. It is a "first" fwiw. Black box, bags, etc. Perhaps it depends on the market they are selling in. I could see why UK dist. BBs only have the UK size. Anyways, it appears mine have either both or US only. and rebel222 is right, depends on the last. The archdale last (the chisel sq. toe) fits me fine. The rounder toe harrington last doesn't quite fit the same or at least on my foot. I will say in general BBs tend to run larger. For instance, I fit into a 8UK in BB in the archdale, 8.5UK in Lobb on the 8000, and 9UK in EG on the 888. YMMV.