A couple of names spring to mind,
MRM Coachworks in Edinburgh ( beside MurrayField Stadium ) done work on the some of mates stuff a few years ago, very good.
Steve Walkers Bodyshop in Bathgate, Whiteside Industrial Est IIRC opposite the Royal Mail depot, done a complete respray for me a few years ago plus some one of custom work on my 309GTi. Excellent but generally very busy.
John.