Try searching mate. It may well take a while, theres not many stockists over here, or at least not online stores. Google is your friend... try searching the forum too for threads re UK online stores, Im sure its been asked many times before.

Cens website has a list of UK stockists too, when I get really stuck for parts, I go through that list, ringing, rather than emailing the stockists. I seem to get a better response on the phone.

Or... as I said... ebay. Even postage from the US isnt bad on small parts.