I'm currently on a course in Milton Keynes at the VWG main centre. Goodwill cropped up. I had no idea that up until recently Audi actually allocate £500 (per car!!) to go to goodwill each time a car comes in for work. Thats If you kicked up fuss. Which is easily done. The system has been slighty abused...so.. They have have recently reduced this to £250. Obviously this is to be used under the service advisors discretion, but nevertheless worth knowing the Audi dealer is sitting on a potential £250 off your bill. Usually the above only applies to people who have been loyal to the brand, ie serviced by Audi fairly religiously. Probably not unheard of by most, and if had, validity may have been hazy. But I've heard it from the horses mouth, so there are definitely benefits of main dealer servicing...but obviously a risk you'd have to take.