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...
If you decide to take the easy way out, at least do it some interesting way, like 5 fishing magnets and ropes... Run out to the space x rocket as it's about to take off.... Ohhhh add some snow skiis and skii into to space!!!