When I ground taxi from a gate on north side at Gatwick for departure (noting the time), to hold at a runway hold point whilst waiting for a stream of heavies to come and go, I am Pilot in Command of the Helicopter. The fact that Gatwick can't deal with a helicopter departure going north without the need to get within several hundred metres of the active, (never mind cross the active) does not absolve me from any responsibilities in the course of my duties as aircraft commander. I have sat in this position for as long as 20 minutes.
Following my eventual lift I will note the wheels off time and eventually my landing time. The Tech log will reflect the time I spent in the air, My personal logbook will reflect the time I was in command of the helicopter from the time I started to taxi to the time I switched off the engines. My logbook has a column for P1 - it does not have a column for airborne time.
If ground taxiing at an international airport and waiting my turn for take off in line with the heavies is not worthy of logging P1 time then I think the ramp personnel, or maybe someone from the Ops department should take the helicopter to the point of departure and then call for me, the pilot, at the moment just before take-off. Actually, there's an idea, this would save me a lot of duty hours and stress!!
I once flew as an instructor with a CAA employed examiner who was doing a type rating. He was adamant that he should be charged for an hours tuition, even though the collective actuated datcon only showed 0.8. He was also adamant that we should both log 1.0 hr. The tech log would however reflect the 0.8 airborne time.