Just a word of caution, the guy has almost no feedback and doesn't seem to have bought/sold anything bike related before. I'd hate to see you get your fingers burnt. If you win the auction I'd only send £100 deposit by paypal and insist on the rest in cash on collection.
I usually ask for a photo of the item against a current newspaper is poss as it tends to link the buyer with the item.
Cheers and good luck.
Ali