its pretty obvious what he's done.
he has listed at £1.00
he then gets emails asking how much you want for it, and he says £1000. buyer buys it and he doesnt have to pay final value fees on £1000.
He should have put it at £1 with a £1000 reserve as bids, but hey ho.
He doesnt deserve negative feedback. This is his business - why do you want to ruin it pointlessly - You bidded deliberatly, knowing that it was never on sale for a £1.00. A negative feedback at the top of your profile can really affect ebay sales and could cost this guy hundreds of pounds of lost sales, just because you want to play silly buggers.
This is typical why melicious bidding is a serious problem on ebay and now sellers cant even leave bad buyers negatives. also if you neg him he is likely to put a non paying bidder form and and then give you a NPB strike.....
ask him for a Pos. if you get one, give the guy one back, so you both benefit.
Sorry if this sounds a bit harsh but as a seller myself who has had issues with the new feedback system, i cant follow this thread and see you leave the poor guy a negative without putting in my 2 pence worth.