Yes. There are the traditional 'empe?as' and also these franchise places that buy and sell used stuff.

There is probably a very good reason for your question, but you have not shared it at the time I am writing, so I have to say..

Why ?

Are you going to fly over there with all your stuff to sell it ?

Why not use the Cash Converters near you ?

Or do you mean Pounds to Euros

No. You have to figure out for yourself how to convert your cash.