UPDATE: So as I mentioned before the agent put the case on hold for 10 days while awaiting more information from the buyer. I kept in contact with the buyer and let him know the situation.

Anyway today is 10 days. I originally got an email from eBay addresing me as the buyer, asking me to contact action fraud?! I replied to eBay to tell them I am the seller, not the buyer. I also explained the situation again.

They replied, 'good news, case closed' in my favour. No further action, thanked me for my 11 years loyalty etc.

It also said the buyer would not be getting their refund. Due to a lack of response to the action fraud request. Well if it was the one they accidently sent to me, he wont have got it, and as it was only accidently sent to me today then he also wouldn't have had time to respond.

I've been in touch with the buyer, and he's as confused as me, but I believe he's going to try and take the transaction up with his bank.

Obviously the outcome is postive for me, but I can't help but feel sorry for the buyer in this case. Unless of course he hasn't done something eBay asked him to that I don't know about.