Back in the late '70s, a mate in his Hunter was killed in an accident out at sea flying from RAF Brawdy. He was on the first wave and was flying a jet with long range fuel. For some reason he didn't come back from a basic GH and aeros trip. We'd seen him earlier, called no threat and carried on with some doggers-over-the-oggers.
The rest of his course said that they'd never been told that, if flying a low speed loop with 23 flap, you cannot recover from a dive if you pork it up and exceed M0.9 unless you retract the flap.... It seems that this vital information hadn't been passed on to them; it was a time when the RAF was pushing FJ pilots through as they were very short - and corners had clearly been cut.
So, for a brief few weeks, people were required to stack no later than 8 hours after Met Brief...... Turn up at 0800, stack at 1600. Fantastic!
Until the infamous Brawdy weather delayed the programme yet again. Then it was back to flying until whatever time was needed.......