I've just had my first 'item not described' from a buyer. I'm selling my Dad's 1960s records and the buyer is claiming that the records I've sent him are warped and wants my 'thoughts'. He's a professional dealer, I think he's fishing for a refund. Anyway, I've asked him to return the records in suitable packaging and I'll give him a refund once I've checked for security marks. What are my responsibilities re. postage costs - do I just have to have to refund the original p&p amount or his costs to return too?