What a fantastic sight! I reckon the pilot of this Typhoon was finding a convenient location to turn around and head back north, and as YO62 is on the northern side of a valley he probably decided to entertain everyone on the ground while doing so. Truly astonishing.
We were camping on Anglesey, quite a few years ago now, when a flight of EE Lightnings came over at what must have been close to the speed of sound at low level. Took quite a few minutes for normal hearing to resume....
Even better than watching the pilotless planes at Shell Island!