Had considered AmD but Essex is a bit of a ball ache for me to get to from SW London, and I don't use the car to get to work during the week.
After a recommendation on here my car went to MMS Technik in Sunbury on Thames, they picked up and dropped back for £20 which saved me a lot of hassle.
No rolling road like AmD however the before and after photos were all the proof I needed that the engine will be better off now. Car was kept for 3 days as the coking is soaked overnight to loosen and remove it. Car seems a little livelier and freer revving although it never felt exactly slow so it is hard to avoid the placebo effect.
Overall I was very happy with the service from Dan (ex Audi AD and OPC apparently) and his guys, a pleasure to deal with and the even touched up one of my alloys for free. Its great to have a good and (relatively) local indie as and when the wear and tear bits come up, and just use the Audi AD for the service and stamps.
Cost was approx £540 all in, including the pick up/delivery and new oil and filters.
01932 788326 or http://www.mmstechnik.co.uk (I have no affiliation, just a happy customer)
Nov'07 Rs4 Avant (Misano) (sold April 14),