And...20mins later the CP is cleared and all is good with the world.
So on reflection:
Jumping from 900 - 5570 shouldn't be done in one go. While it didn't 'break' anything, it does cause some issues.
Look and don't accept what people on the forums say as 'fact'.
Most of the feedback is from people 'trying' these things at home. Based on what I have read and done...each upgrade can go differently. My experience shows that you can't upgrade but I've needed to go to Audi to get CP removed. No harm done and in the end I've saved a few hundred pounds not having an Audi engineer sit and watch the screen for a few hours. If you have concerns...spend the few hundred pounds and let them do it.
Thanks to those who helped.
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