I would definitely try Audi on the Tyne Tunnel. I got warranty work done there when I had my R8. They fitted and painted a new bonnet (well it's the boot really) as it had slight corrosion, whilst they were doing it I asked if they would paint the door as it had a slight scratch on it. They done the whole door and blended the wing for a perfect match and only charged me £80. Fair enough it was already in and they had spare paint, but for the quality of the work it was great value. I really couldn't tell what had and what hadn't been painted, it was easily as good as the paintwork from the factory, it was pearlescent Daytona grey so not the easiest colour to match I wouldn't have thought.