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Thanks for the replies guys. In answer to your questions: I'd had the item for a while as both myself and the sellar were lax in our replies to each other (or rather, I was and he had had problems with his email). The item condition wasn't described: other than to say it was rarely used. But seems that we had a communication problem, the sellar has confirmed that he will refund what i paid for the pad and the postage, he wanted to check that he wouldn't be paying for my return postage costs. Hes been pretty reasonable to be honest, so it seems fine.
Thanks for the advice though!