Don't give up on it. People like this need to get their commupence otherwise they just carry on and do it to someone else. Unless he is an expert with a few quid behind him (and I doubt it) he will not be able to vanish without trace. If you haven't already done it get the High Court Sheriff involved.

Quite surprised by some of the posts here suggesting there is fault on both sides. The fact is that the matter could have been settled by Wood returning the money and Geoff returning the amplifier via a trusted third party (Marco). Wood refused to go along with that, making it pretty clear who is in the wrong here.