I am a US 11 and I wear a UK 9. Shoe shopping here annoys me no end, because I have long, narrow feet and apparently if you have large feet they're supposed to be wide.
I actually only buy shoes from Hotter now. Because they make long lengths that aren't wide fit and the shoes are comfortable and they last for ages too. I have to buy my safety boots for work in the mens section of the local industrial supplies place.
I just bought sheepskin slippers from Lands End because they have my size and have a proper good sole and coverage of the foot and aren't just clogs. Expensive, but I live in my slippers in the house. The last pair I got was from Lands End and has lasted me over 4 years.