Helimutt, I didn't actually notice any sign of a sense of humour...
I'll say it again, imagine you've just taken your shiny new police helicopter out of the hangar, started it up, and then say a nicy shiny fire truck or fuel bowser is too close and as he moves off, he clips the helicopter. As far as your concerned, there is no PIC at that time? Who would sort out the accident report and what would they be called in that paperwork? 'Person sat on their backside who happened to be at the controls at the time?'
Regarding PIC before "moving under it's own power"; you obviously didn't bother to read my earlier post at the top of the same page, (#81) in reply to Whirls' comment on the very same issue.
Responsibility and logged flight hours are separate issues in this respect. Not my rules or opinion, but those of the CAA. And of course, of your company chief pilot (and mine, that's me though) and the aircraft insurance company.
Thanks for your input to the discussion; it's been enlightening. If I'm in a position to recruit another co-pilot (recruited two in the last year or so), possibly to help them "do a Flingingwings", I'll be perusing applicant's logbooks very carefully and asking deep and meaningful questions at hours logged by ex-offshore co-pilots, especially ones from Humberside with a share in a light aircraft.
That's just
my sense of humour, coming out there, btw.