Quite a lot do but it's worth trying music magpie and CEX as if some are in demand you can get quite good prices. Most will be pennies, but some are 50p, £1, or more and a large number can add up quite quickly
Thanks for that Rowan, I've never heard of either, but having Googled them, CEX has a store near to where I live, but I can't find any stores for Music Magpie.
When I've gone through them, I'll take them to CEX next time I'm near there, less messing about.
If they don't want them, there are charity shops nearby too.
Thanks for your answers.
Cex will also give you the option of cash or higher value if you spend what they give you in the store i.e. if you wanted to put the money towards a second hand phone or other device