I was ground crew for the Lightning display in 1972. We travelled all over Europe and had a ball. I can't remember the pilot's name after all these years but he was one of the best I've seen.
We asked him once how he got his aircraft so low during his low level, high speed pass. His reply was that he lined up with the runway centreline at about 450 knots and just kept gently pushing the control stick forward. When the aircraft wouldn't go any lower he reckoned that he was riding his own shockwave and that his ventral fins were about three feet off the ground!!!
At RAF Wildenrath he pulled out of his run and asked for the crash barrier to be lowered as it was too high.
At Newcastle, part of the turnround servicing in volved us pulling part of the approach hedge out of his port aileron.