All the experts on here now need to contact Sussex Police and put themselves forward as 'experts' as the police will need them to help understand the footage plus carry out the theory tests on the ideal required height/speed etc for the manoeuvre. Also, possible testing of aircraft instruments and examining the aircraft itself.
At the end of the day I do not see why they couldn't have access to both the footage and test results info, it is in the public interest to establish the facts and the police do not have the man power or expertise to do so. The only real experts are the AAIB unless the police call on another countries equivalent like the FAA to help them piece all the facts/information/evidence together.
They can't use anyone in the UK as most will have some form of connection to this incident, either via the pilot, owner, maintenance company, organisers or the AAIB which will result in a conflict of interest. After all the pilot is well known in the aviation business and has many friends, there is only a handful of maintenance companies that look after such aircraft (most of which this aircraft has been with) and presumably someone from the AAIB can't be used due to a conflict of interest (even if they haven't been involved with the investigation).
I await the AAIB report but fear this will be delayed to after the pre-inquest hearing in November and possibly the actual inquest itself. Then depending on the result will have wait and see if the HSE get involved with any prosecutions.