I did it as a 16yo Air Cadet in summer 1978 in the Sim at Valley. After an uneventful takeoff, got reset and told to do continuous roll at 10 degree climb. Did that, got asked if I wanted to go supersonic. Right you're at 40,000ft. Push over into a dive (can't remember how steep) quickly so you stabilise & accelerate before losing too much height & hold the wings level. first attempt, lost control so got reset. 2nd time, -1.5G push into dive, >M1 for 6 sec max M1.06, 6.1G pulling to recovery at approx 5,000ft. Not so good on the ILS landing. At one stage I was 4.7 miles out at 25ft, I think that put me in the middle of Holyhead. It was the only Summer Camp I went on & as I let it be known I was joining-up (planned, & what I did 5 weeks later) I got to do stuff that the other cadets didn't.