You could try www.candywheels.co.uk they're next to Beavers Waterworld in Tatsfield, haven't had any work done by them myself but he seemed like a decent guy and his work was spot on.
Cheers Nick, I'll pop up and have a word with them, didn't know they did powder coating. Nice guys though, had a chat when I've been to the cafe at Beaver World. The fella there has an original Kirk Precision - ask for a shufty next time you're there.