Harry,
I don't suppose you ever crossed paths with a chap called Leslie Kershaw during your time doing snatches? Post-war he too was training on doing pick-ups in the Hadrian and he said it was only a small group of people who were ever trained on it.
Second and somewhat unrelated question. Post war it appears that some Horsa's had their upper surfaces painted silver in the UK? Seems to have been common at the Parachute Training School and a few machines of the 1333 TSCU. I just wondered if you had any recollection?
I believe it was done to machines that may ultimately of ended up in the middle east and the theory was the silver top coat reflected the sun and kept the interior cooler.