I'll take your advice guys and fob him off. Pity as I probably won't get another buyer now and he may be totally genuine. Still, saves me the hassle of packaging it up and having to do paypal. I'd much rather keep it simple and meet sometime with cash. Ok thanks guys.
Offer to list it on eBay at a slightly higher price to cover the fees
I sold a few things on Gumtree very recently and had various people begging me to post it and this seemed to wean out the serious ones. I still found local buys for everything in the end anyway