As a British person, CeX is pretty cool but it's really the only larger tech chains in the UK if you don't want to shell out a kidney as opposed to just buying online. I think they're also all across Europe - saw a few in the Netherlands a few days ago. Usually a cash exchange place is better...
they need to have a strong line up on the launch titles too. I think they should move metroid prime 4 to the next console because by now it has been quite a while and there's no release date scheduled yet
well as far as metroid prime 4 is concerned, the next system probably is similar enough to the current gen they can probably easily just slap it onto a next gen cart and call it good