Gloucester/Cheltenham area ,but Listers @ Evesham (13 miles away) did the trick. Don't get to use the smaller garages, we have a mechanic who looks after the out of warranty cars and they get changed before the mileages get too excessive. I believe there is a garage at Gloucester called Richard Hulin who specialise in VW/Audi/Porsche who are non VW dealers (01452 502333).
If you have a cable like a bike's brake attached to your thottle pedal one end leading to the fuel injection the other, and it physically moves when the pedal is depressed with the ignition off, chances are it isn't fly by wire and you have a "normal" setup.
Strange the car is now ok, that's the problem with these intermittent faults, no one believes you.