Motorsport world do them,
http://www.motorsportworld.co.uk/http://www.motorsportworld.co.uk/
They do mail order, i know on their site they dont list every single product for every single car, but if you give them a call theyll sort you out.
My mates got a C2 VTR, due to this being a new model there isnt alot of aftermarket parts out for it, but motorsport world have managed to get a hold of some parts for him i.e a BMC CDA, springs etc.
I bought my brakes from them, (Black diamond fast road gross drilled n grooved discs with black diamond pads), they also done my full stainless cat-back system to.
Highly recomend them!
P.s on their site they dont show any BMC products at all, but they do do them.