Unless I'm very much mistaken they closed all their UK brand shops a couple of years ago, which is a real shame. Chiswick Cameras is a stockist, but their website only shows a fraction of the bags Crumpler EU produces. However their website's return policy is pretty good (within 14 days, no cost to return if the goods were over £40).
What style of bag are you looking for and what else do you want to carry?