Just had a chat with Randy at FbF. He'll do the kit's for $850 (£473) if we get a group of us together.
The only issue is that (as they use re-furbed barrels) we'd all need to send our barrels out to be done together. Import tax on the way back isn't a problem as we'd have a record of sending the goods. Don't know how much freight would be, but guessing about £25-£45 if we get a few together.
I can only assume that Neil is thinking of doing something similar (which'd be a hell of a lot easier).
Ali