Well, I tried to help. I called directory assistance to get his phone number, and of course, he's unlisted.
I looked at the T-Nation site map and there's a few UK T-Men who are sort of close to Milton Keynes.
Just a school of alternative thought on this subject. Another T-Nationer sent me a pm just yesterday saying he was approached by someone from the UK. Turns out it was a classic scam.
I work from home for a large US based web site. We were plagued by scams last year. There are a LOT of scams seemingly originating out of the UK - and most are aimed at identity theft. What we've found by investigating, is that the IP on these things are usually out of Nigeria or India, and the UK name and address given are of a real live person. The only thing is, that it's a real live person who's identity has been stolen and is being used as the smoke screen. Chances are, even if you track down Mr. Levett, you'll discover he's a victim as well. Then again he could be just what he appears... a no-good thief.
I guess what raised my curiosity about this is that it's UK-based, and the guy gave you his entire name and address, which appears to be genuine. It's just too much like what's going around right now, and they keep re-inventing the scam to keep everyone confused. It's probably a coincidence in your case, especially since it's an E-Bay thing, but it was just similar enough for me to want to mention all that. E-Bay is really good about policing their sellers. I'm assuming you've raised holy hell to them about this guy?
Sorry to hear you got scammed. Good luck to you resolving it. Do be aware, if he sends you a refund, and it's for MORE than what you paid, it's definitely the same scam.