Knife Edge, that's the one that I was writing about above. Talk about death by afterburner, everything shook. And in which case you would remember the 2 104s one under the other as I described!
Hi GF - Yes that was the German Navy Vikings F104 pair at Fairford where the high speed pass under the slow(ish) pass went trans-sonic with a double boom and the hit of a pressure wave. Very memorable!
The arrival from crowd rear of (I believe five Canadian) F104s on afterburner was much further back in time as it was when the Air Tattoo was at Greenham Common. Bit sketchy on detail because I was a kid at the time.