Also it would perhaps be advisable, depending on how quickly you need the camera, to buy online - if Jessops sell it for �485, it is highly likely you will be able to get a better deal online. I would suggest you try Kelkoo or a similar price comparison site to get at least a feel for online prices first and then do a Google search for other outlets that may not be covered by Kelkoo.
I also agree totally with spat to check what you will be getting for the prices quoted by any company.