I do not wish to speculate on the accident. However, I have now seen an unusual detail on video posted at youtube. During the hard rolling break after the fast flypast, a definite trail is seen for two seconds and again, after the reversal, the trail can be seen faintly for approx three seconds. The video is jerky but, I consider the trail to be real and not an aberation.
The video can be seen on youtube under "Shoreham Hawker Hunter disaster (added material) - Tragic Hawker Hunter Plane crash". The detail I am commenting on occurs in the first fifteen seconds of the recording.
OAP