Thanks for the replies. They seem to contradict each other, however. Assuming I don't want remuneration, can I instruct (not for the grant of a licence but for example for differences training) on an N reg a/c in UK airspace only? If the other guy also has an FAA PPL based upon his UK PPL who is PIC?
My FAA Airman's certificate was issued when I had a UK PPL with Night, Twin and IMC ratings.
Thanks for the info.
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"Take-off is optional, Landing is mandatory"