I'm around 47, 47 Wide, 48 in cycling shoes depending on brand (and what I can get cheap).
Normal shoes, I dunno, I think I tend to aim for 47/48 again depending on brand.
Best bet is probably to go in and try some on. Might be a good excuse to get me out of the house on the weekend.
I've got size 46 which according to Giro is a UK 11. I'm normally a 10.5 in regular shoes.