Hi Richard,
I had mine done a month or so ago by these guys...
http://www.thewheelspecialist.co.uk/locations/wheelrefurbishmenteastgrinstead-sussex/
They did a superb job on 4 wheels for £312 inc...which was the price for me driving in, having the work done, and driving out again..I actually removed the wheels myself and took them up there in my Defender and they took 2 days..fitted and re-balanced afterwards...
Gunmetal grey instead of matt/satin black...Nice job I thought...!
I did Meg's a few years back:
Having used many companies in the past, City Powder Coating is simply THE BEST: Chemical strip, sandblast, powder coat and lacquer. They also offer same day, drive in, drive out service;
http://www.citypowdercoating.co.uk/
Value: £20 per wheel or £30 to remove the tyre, refit with new valve and rebalance