Let's say Plod gets the GoPro footage. They will not doubt then go to a few 'experts'. They'll stop when one says, "based on my years of experience, blah, blah... that this was a clear case of criminal negligence and the pilot is totally to blame". Job done, banged to rights. Then no doubt the filthy compo lawyers will use the same evidence and different 'experts' to determine that [insert the name of someone with insurance] was totally at fault and they will walk out happy with the cash. Then the AAIB may give another version - the more likely version, the one with possibly a more nuanced causes - based on facts. But let us not stop there. The CAA have already worked out what has happened because they have shot their load already... (The CAA are unable to work out the difference between what and why).
What a system. A free-for-all farce with too many players. It cheapens the memory of those who have died, has already pointlessly reduced the spectacle of airshows and until we know why this event occurred, has failed to make airshows safer.
PM
ps. Task the CAA with oversight on firework shows and we would only be allowed underwater fireworks.