'a level of competence appropriate to the holder of an NPPL M'
Hi Heston. Where is that quote from?
Sounds to me like the CAA trying to turn 'Differences Training' into a Class Rating.
Personally, I think that 'Differences Training' should be focused on specific differences and, in this case, should only be required for transition, either way, between weight shift and 3 axis.
MJ