Rules for jobsworths
A lot of this industry is 'vested interest dressed up as safety'.
The Americans have a 'drive down the costs approach' we on the other hand prefer to affiliate ourselves with our protectionist continental neighbours who are into bureauocracy and control.
As for the 'who is P1' on instructor flights thats a minefield on both side of the pond, e.g. two ME instructors checking each other out on an extended rent to gain hours...........
There a lot of temptation to reduce costs by activities such as that