I'm reposting this from another forum:
I was on the flight line and saw the crash from several hundred yards away. I will not offer my thoughts on the direct cause of the crash (for obvious reasons, given the nature of the internet), however I will let you know what I saw.
He flew in from North Weald, and begun his display by making a pass along runway 02, before climbing, turning left and flying directly towards where I was (in the crowd near the A27). It had flaps down at this point, and was flying fairly slowly. He was flying on an easterly heading. He then turned left again, flying on a heading of around 050. Note that I may be wrong on this – he may have done some other manoeuvres beforehand but as one can imagine, the shock of seeing that happen didn’t help my memory.
Anyway, he climbed up to an altitude of, in my opinion, 1000-1500ft. What he was performing was clearly a half cuban 8, which is when one climbs up, then rolls inverted before completing a downwards half loop and continuing on (looks like half of the number 8 on its side). Anyway, after the climb he rolled inverted and began descending inverted. I could still see that his flaps were down and I assumed that he would roll into a turn and continue (as he did when he first arrived at the show, after the low pass). I saw him fly down, and by the time the aircraft was level, he was at about 100ft. However, he was descending very fast and at a very high angle of attack. At this point, the wings began to wobble and he was still pulling up – the nose was up about 10 degrees and the aircraft was still descending very fast, at a very high angle of attack. It then disappeared behind the trees and a massive fireball appeared. Even more unfortunately, “Magic Moments” by Perry Como was playing over the tannoy at the time, which was stopped immediately after the crash, and the commentator said “what a beautiful aircraft” a few seconds before impact.
I noticed myself, along with just about everyone else, staring in disbelief with my jaw dropped. I turned to the chap standing next to me and we exchanged looks of “what the f***”. I briefly discussed what I saw with a couple of other people (such as flaps down, etc) before returning to the hangars. I was hanging around at the college, and returned there for the rest of the day. I was there with my friend, whose father is a member of Raynet, which is a bunch of HAMs who help coordinate things. He had a good idea of what happened (police etc… were in the same room, and the meeting to decide what happened with the airshow took place there) and the last number he heard was 10 fatalities, not including pilot, and some people badly burned on the ground from the fuel.
The show is cancelled for tomorrow, and the airport is closed. The A27 is closed and there is apparently damage to the road surface. All in all, a pretty shit day and I’d probably have rather stayed in bed.
Edit: some additions added below.
No more flying took place after the crash. I think that had it crashed in a field and no one hurt, some more flying may have taken place later on (such as the Hurricane crash in 2007). But due to the fact that it killed a number of people on the ground, this obviously made it a little more serious.