I had an issue on e-bay that sounds strangely like yours Ady several months ago. I never got any relplies from my dispute with the funds id payed from to the Isle of Man who was visiting a sick mother in Leeds at the time of the transfer, and he'd promised he'd post it as soon as he got back. This was a reputable dealer, with 100% feedback, but im still waiting after e-bay had contacted him. I got something from Hong Kong in three days for F.sake.
Re-claims the money!
Thats my only horror story in over 200 tranactions there though.