I've now had 4 frames done by Trestan Finishers in Woolston, Southampton (tel. 02380 433081, or visit www.trestanfinishers.com
). They only do single-colour powder coats with some limitations on range (but for a surcharge will order in your colour of choice if not stocked), but can add sparkle powder for a "metallic" look, and the quality of the work is very good plus they add a nice glossy top coat of clear lacquer making all the difference compared to just using powder, which can sometimes come out looking a bit "flat".
Prices are very competitive - I had 3 frames without forks done for £30, whilst the Quadra was a frame + fork job at £40-ish, including all paint-stripping and surface prepping. They also use inserts to stop BB, headset and water bottle threads from clogging. Oh, and it's a finish-only service so you have to sort your own decals out once you get the frame back.
"Not so much a religion as a savings club for people who think Star Trek's a documentary"
- Marcus Brigstocke on Scientology