Anyone know a decent Audi mechanic in Sheffield?

Hi Everyone Does anyone know a decent Audi mechanic with the proper VAG-COM software and cables in or around Sheffield? My A8 has been in a garage
now since 22nd April with an electronic fault that caused the gearbox to go in to limp mode, and I am sure they don't know what they are doing with it even though they claim to be Audi specialists. I have spoken to ZF who tell me that it is probably a fault with the multifunction switch, the other fault was shift solenoid locked. Any help greatley appreciated.
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