I remember him well; my trial lesson (1971) and much of my subsequent PPL training was with Johnnie. Certainly he had about him the air of an ex-RAF flyer. But he wasn’t JEJ. As I recall, he was a good instructor, ie he could teach as well as fly. One of his party-pieces was to put his tobacco tin on top of the panel below the compass and fly the 150 in such a manner as to make the tin float around.
Blimey, my calculator tells that was nearly fifty years ago.....