Finally I have managed to track down a company in Bristol that does arch rolling. It is a well established company that excell in race car prep and bodywork mods. My car is being book in for rolling over the next few days. The guy I spoke to was very friendly and new how strong the gen7 arch lips are and also asked how far do I want them rolled. I don't think its worth asking for a group discount as wait for it.........they only charge £20 per corner. I will post up there name when I've had the work done and can report on the quality of work,I'm confident on a great job as they were recommended by a friend who had his arches done by them.