I have had it done twice. Once by the dealer when it was in for the MOT they did the MP3 drive for about £25.. A few years later, they refused to do it for a used cluster - took it down south to be done by an indy who had the Audi VAS system. It took him 5 minutes and does it to any module that is in CP, they can't choose specific ones.
If it happened again, I would probably go to the dealer and say it happened after a flat battery and the AA said take it to the dealer to remove CP.
The way they remove it is by reading fauly codes, then Guided Fault Finding of the codes it sets which ends in clicking Remove CP, it then scans every module clearing the CP. It is quite easy and they shouldn't charge much, especially combined with an MOT or similar.
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