I attended a CAA briefing a few years ago where this issue was discussed with the then Chief Flight Examiner.
When he was asked how to log something like a check out he told us P.1/s was not appropriate, since it is not a test.
Then somebody asked what to do if the 'student' insists on logging P.1, but the instructor (desperate for the time in his logbook) wants to do the same.
Chief Flight Examiner answered: 'We don't care about this. It is not a safety issue'.
Attendee: 'You mean we can both log this flight as P.1?'
CFE: 'We don't care. It is not a safety issue'
Attendee: 'Can we have that in writing please?'
CFE: 'Don't be silly!'