MPH. I take mine to Techniques in Hertfordshire and they certainly know their way around the Aero chassis cars, I've seen all types there from S1 to Max in for work including a Coupe in for a crash repair on it's rear panel. A replacement for a split radiator has been the biggest job mine has required so far bar routine servicing. They are however a much shorter journey for me from SW London. No connection to Techniques, other than a happy customer over 9+ years.
I think James BW who has an S1 also hails from your neck of the woods, perhaps he'll be able to advise you where he goes.
