Originally Posted by
WhoopWhoopWhoops
Legal information N registered aircraft
An IR (r) instrument rating restricted (old IMC) has no validity outside UK airspace, it is at present a UK only qualification.
The IR (r) qualification is also only valid on UK registered aircraft flying within UK airspace and has no validity on USA registered aircraft flying in any countries airspace including the UK.
To fly IFR in an N registered aircraft anywhere the FAA licence must be endorsed with an instrument qualification.
A UK issued IR (r) or EASA full IR does not authorise a pilot to fly an N registered aircraft IFR.
In a sea (sorry) of speculation, that seems to be the first real black & white bit of info we have had on this thread.