To a large extent this whole argument comes down to;
A cross-channel check takes place. Pick any of those above who demand that they are P1.
Some time later the CAA legal department make a claim that some illegal act occured during the flight - low flying, incorrect paperwork or whatever.
I can guarantee that if legal proceedings were a possibility, those who demand they are P1 would be only too quick to point the finger at the instructor in order to defend themselves.
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What this thred highlights more than anything is that instructors are not doing a good job when it comes to crosschannel checkouts. If they were then we would not have people making statements claiming that the instructor was merely a passenger. Of course there is the old you can't teach an old dog new tricks posibility but I get a lot of "I don't need a checkout because I know it already" feeling from many posters.
Regards,
DFC