If you are in the Surrey area, I can recommend the following ARC very highly. Bells Accident Repair Centre, Cathedral Hill Ind. Est. Guildford.
www.bellsarc.co.ukThanks to Conan (Luckygti) for this.
Reassuringly, there's a nicely modded Mark 4 GTi & a V64Motion in the staff car park, so you'll be in caring hands!
Ask for a chap called Steve to do the spraying, he loves VW's according to one of his colleagues, and he does a mint job. All blended in brilliantly, and they gave my car back fully cleaned inside and out, hoovered and tyres blackened.
The owner, Richard, is a really nice bloke, and sorted my estimate by email the same day.
When it went in, they had problems with the old lacquer causing the new lacker to keep peeling off, so they had to keep redoing it. It was a smal ding that had been previously repaired, and had not been done properly. The thing was, they did the extra work and charged me no extra. Really good guys, great work, and they won't rip you off.
Basically, well chuffed!