Apologies, John!
Any fool should have known that you referred to the Slingsby T21. Even
I have heard of it, but didn't make the connection.
Now you have me puzzled though.
You had the Scouts' emblem on the fin, so did you fly with the Scouts? My enquiries on line showed some of their gliders marked AIR SCOUTS, but still blank fin.
The AIR CADETS labelled gliders seem to be Air Force owned, carrying Roundels, fin stripes, and Air Force numerals.
btw When I was in the Air Training Corps, late 1950s to mid 1960s, "Air Cadets" wasn't heard of, though I know that's the current name.
Nobody ever offered us glider flights.

Even though we were based at Northolt, I only flew once, in a Chipmunk, and that may have been at Hendon. Can't be sure, as it was not entered in my Record Book.
