I was an instructor at a basic FTS in the midlands, when Air Marshal Sir Patrick Dunn was C-in-C. The new doctrine was that the Command was chopping too many students and effectively that there were no bad students just bad instructors.
The school had rather a family atmosphere and (I think) a low chop rate. For all that, there was one student whom we all wanted to chop. The student in question was a bit of a BS merchant, did not seem to be listening to instruction (we most of us flew with him) and failed the odd check ride. He seemed to have natural ability. He was at least once trailled by an instructor because we suspected he was wasting or misusing his solo sorties. My own view was he was actually something of a psychopath. The nub of the problem was one of Personal Qualities. We agreed that we could not see him as a responsible aircraft captain; we saw him as bound to be the death of someone in due course and we feared that someone might not even be him.
With the doctrine at the time, we could not chop him from training. The school closed and I was posted. It would take some research for me to put a name on him now. At the time I had an interesting overseas tour to go to, so I made no attempt to learn if our forebodings were justified.
Sir Patrick Dunn refused his next posting as an overseas C-in-C and took early retirement. As far as we were concerned, being miles below his pay grade, we thought him twice a failure.