I know of one that's REALLY good....

Brown & Wilson Coachworks
Benton Park Rd
N'castle NE7 7LX
0191 285 9542 - Dealt with Mike Brown

They fitted and painted my sideskirts on my Sapphire. Did an A1 job and they're really reasonable. They're right by SoGo (South Gosforth) double roundabout next door to Focus DIY & Sage Computers.