Jock,
It all depends on the store. We had quite a few at the place I worked (in Napa Valley.) It's been over a year since I left, but off the top of my head we had Montgomery Cheddar, Keen's Cheddar, Isle of Mull Cheddar, Double Gloucester, Caerphilly, Colston Basset Stilton...and I know there were at least a few more that I can't recall. Here in Missoula, MT I'd consider myself lucky to find even a single British cheddar.

David