You'll have to put it on a refurbished list, for it to sell. £500 may be all right. Keep it on the list at £500 for a while before reducing its price. The problem is, for £500, people would much rather get a new, more advanced/modern laptop, as opposed to buying a used one. Personally, I think if you really want to sell it, you're going to have to settle for around £350 or less. In spite of it being in good condition, it is a relatively old model and has been around for some time now. Your first choice should be amazon UK. Last resort, Ebay.