i used a guy called nigel, who does quite a bit of work for Merc garages etc. Very good, very reasonable too. He did set of 4 rs4s off my TT and set of 4 rs4s off my A4 avant. He spent about 3 hours doing the first 6, then took the other two away to do the next day.I.m in Wakey, and he covers all surrounding areas i believe.
Totally recommended, 07890 392651