'The standard of proof shown in court must be beyond a reasonable doubt, which surely makes it extremely difficult to prove recklessness and almost as difficult to prove negligence, especially in a high stress situation such as an airshow? '
Depends who has been negligent and what their relation was to the aircraft. Obviously a pilot error/misjudgement more difficult than maybe an error with maintenance that has bee negligent.
The AAIB report states there were no reported faults. Do all faults get reported/recorded? I personally would hope they do and would also hope that repairs are carried out correctly.
I am assuming it will take the AAIB several months to reconstruct the aircraft and check it thoroughly for any failures.