ORAC,
Your G91 story: I believe a W/Cdr Chater in Burma ('44) acquired a "personal" Harvard by some variant of this method....D.
Union Jack,
This tale is of great antiquity. It was well known in the RAF over 70 years ago, and was first told to us by our old Drill Corporal (and he'd been put on a charge by Flt.Lt. the Duke of York in about '22) so it went back a bit even then......D.
Cheers, both. Danny.