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...
@Xdqwerty, Osu! Tatakae! Ouendan! is the Japanese version of the game, different settings/characters/songs but otherwise identical mechanics. I played that before I knew about Elite Beat Agents lol. Both fantastic games https://en.wikipedia.org/wiki/Osu!_Tatakae!_Ouendan