I can't recommend any personally, but there seem to be quite a few available if you Google "fat quarter shop". Have just been browsing one called Pelenna Patchworks. I imagine they're more expensive over here though.
I have a ridiculous fetish for fabric after looking at all these so should really get around to doing something creative. We have a really good fabric shop near where I stay in Linlithgow but I am greedy and want more and more! I go all Kirstie Allsop at the sight of them!