Beagle,
As I remember him telling it, he was chasing a Vulcan at FL400 when it went into a dive to lose him. He was head down on the AI23 and just keeping it centred when something nagged him to look at the instruments, he was descending vertically through the 20s at M1.3+. He pulled the throttles to idle, selected air brakes out (they're speed limited and would only come out when the speed decayed), pulled and waited.
At some stage the brakes the deployed and the G started coming on and he passed out. He woke up with the aircraft in a shallow climb with the altimeter unwinding through -200ft (It had a +/- 700ft error at low level/high speed.
I also remember Porky **** flat spinning during a scissors at around 9,000ft. (The book said eject at that height, but that assumed that the spin had started much higher and that the aircraft had developed a high rate of descent.) His wingman called for him to eject as he passed around 5,000ft but he decided to stick with it as, at that stage, he had the nose down. At the time, he said he pulled out at about 100 ft, but that went up substantially in the report...