Seconded.
I doubt you will find any UK and probably European public transport operators with N reg Aircraft. My understanding is that the CAA will not allow a UK company to operate an AOC using FAA regs etc. An American company may base its N reg aircraft in UK etc which is why Atlas have a 747 based here. Privatly owned Aircraft may be operated and owned in the UK, hence the Nreg Biz jets and light singles and twins you see around.
Hope I got that right.
All the best
