Thanks for all the other suggestions, I appreciate the posts. Just to be clear this is what I did:
1/ Calibrated neutral, forward and then reverse (with the flashes confirming all working)
2/ Wired aa bb cc
3/ Tried every ab bc ca etc etc combination
4/ Checked for shorts between motor wires
5/ Tried another motor
6/ Tried the motor on a different ESC (worked OK)
7/ Tried a different radio system
8/ Full reset on the ESC and tred most of the above again
Conclusion - its buggered, I was an electronic engineer way back so I did consider stripping it down and fixing it but so many components are surface mount and hard to source that I would probably just invalidate the warranty for nothing.
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