What goes on in an N Reg aircraft is a different matter
No it isn't. JAA FI is a UK airspace requirement regardless of the airframe reg, for remunerated instruction and, of very recently, I am reliably informed, this applies to FAA checkrides too.
But the ANO is UK only.
Overseas regs differ and if you post on that you need to post references to the local "ANO". Quite simple really.