i have used argos and bob jackson, would highly recommend both
argos did my lime crosswork, aluminium frame, steel fork, fade paint and made stickers, was over 200quid, be very specific about the colour though. but the quality is very good and it has bearly a mark on it 2 years later.
bob jackson did the paint on my old clockwork, steel frame and fork fantastic finish, mirror finish british racing green, very brittle paint though but lots cheaper but i prefer this finish, about £137 iirc but that was with frame, 2 forks, and mag 20 lowers and postage back.
bob also did my aluminium O frame and fork , aluminium frame obviously, very good finish, stickers were fantasic and very accurate to the original ones. very chuffed with this and only about £120 iirc including postage back.
i have also seen work done mercian, a resto project for a former customer, that looked fantastic aswel
hope that helps