Tough break, Tom. I'm constantly in the same boat. It's frustrating. It used to be so easy to get £50 on the spot by selling a stack of albums in to One Up; but they've since restructured their second hand department by: a) paying less money to the seller, and b) hiking up the price on the shelves. Which seems crazy, given they made a healthy amount from their previous system. So I'd avoid that now.
Other than that, I can only second the musical gear. Especially the likes of effects pedals.
If you advertise your clothes well on ebay, there is some money to be made out of that.
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