Sorry mate, its hard to find any place that sells stuff 'designed' for cabs/cp's in the uk at all....
It seems a custom job from a design/media company is the best, or go for the shipping tax....
Although if happs have what you want, they have a branch in the uk. The prices tend not to be as good as the US, but I found them good to deal with. If they don't have it in, I think they get a weekly shipment of stuff over from the US, so can get most stuff.....