Somehow I doubt they would. Here in Holland, the only Shimano I have seen is a "model" name I never saw before, sold in Halfords packaging. I suspect that Campagnolo is pretty fussy about who resells their stuff, and would opt for higher-end bike shops.

However ... it sounds as though Halfords in the UK may have some more specialist bike shops. True? If so, are there any around Shepperton or Uxbridge? Or perhaps Welwyn Garden City? I should be going there on business in a bit, and am looking for stores to visit while there.

Cheers...Gary