A slight aside if I may gentlemen. I was fortunate enough to fly in most of the beasts I worked on in my RAF career. Every one accompanied by a briefing regarding abandonment of the aircraft, whether by bang seat or manual separation. As one who enjoyed membership of the RAFGSA, and a few hundred hours of gliding, I can't ever remember a briefing on abandoning a glider. I have to admit, it would have taken a major problem to have made me jump, but no one ever told me how to do it. I also remember wearing a parachute on air test in Albert from Colerne (early 70s) the briefing being, if you see the Nav go out of the crew door, follow him.
Smudge