To fly an N reg. aircraft anywhere in the world then it must be by reference to the USA FAA regulation. I believe however that the aircraft used commercially must be recorded with the FAA as being used as such. If you are only acting as the paid pilot for the aircraft owner then the owner remains the operator.. This is considered a private flight but the pilot must have a commercial licence if payed. If the pilot is an 'employee and the main role is not to act as a pilot then the pilot does not have to hold more than a PPL. For private purposes the FAA permit the holder of a licence issued in the same state of the airspace, in which the flight is taking place, to fly the aeroplane.
The CAA does not have oversight for FAA registered aircraft. You are only required to apply/register with the CAA / Dept. of Transport if you wish to use an FAA licence to fly a UK registered aeroplane. If you already hold an appropriate UK licence then you will use that to fly and so the FAA licence is not an issue.
I agree with whopity that the stupid rules requiring 100 hours for PPL use is unnecessary but is left over from the bizarre EASA regulation borne from anti American thinking. There is no safety argument to require this. Hopefully the UK CAA will eventually correct this.
Last edited by Fl1ingfrog; 27th May 2021 at 09:21.