Jhieminga is right the query is on flying a G reg airplane with an FAA PPL.
N reg airplanes I'll fly wherever I like
Seems that the thing to be extended from April 2017 to April 2019 was/is in respect of a G licence holder flying an N registered airplane.
Believe me this is all very complicated and confusing - possibly the answer to what I am asking is so ridiculously obvious that it is inhibiting the answer?