I know this doesn't help if you've already bought it and I don't condone it at all...

but you're not legally bound to anything. The worst that can happen is you'll get a negative feedback point. You can buy a £1's worth of stuff off me and get the point back if you like.

ALSO, if he stopped the auction early it's no longer anything to do with ebay and he won't even be able to leave you feedback because you shouldn't appear as the winning bidder.

I sell a lot of gear on ebay including some of the part ex's. I used to get wound up about people not coming through with the money or trying to get you to end the auction early, but it's not the end of the world. As long as there's breast to look at life can't get too bad