Heres a quick recommendation of a store based in the UK called PSP Tree they specialize in all things PSP and have a wide range of games, accessories etc just for the UK market.
Check them out Here
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A "sincere" recommendation with a referral-enabled link?
I would stay away from the Joytech PSP Tech Pack they sell. The headphones are rubbish, easily break, and the "Soft" carry case is made from a material that will scratch your PSP!
thanks for the heads up