I highly recommend Mini Spares, they are the big boys, and almost all A-series part distrubution comes through them in oen way or another, but with the pound near 2 to 1 over the dollar and post 9/11 shipping charges, they amount you can save from ordering from the UK is greatly less than it used o be, only large orders make sense. Also you need to be careful of what you order, I've saw folks pay big money for stuff like Cometic head gakets and ARP fastners that were made in the US to start with, remember there are about as many performance parts for A-series made here as in the UK, since we race them in greater numbers and higher performance levels than them.