Maybe if the AAIB report was able to be concluded in a timely manner then non of this would have been needed?
Cannot say for sure but the length of investigation, after quickly ruling-out mechanical failure, suggests that the AAIB have not been allowed to crack on with the investigation, unfettered by other government departments or industry concerns.....
Timely investigations are done to ensure such an accident does not happen again.
Maybe the AAIB has now become un-fit for that particular purpose - I hope not, as they lead the field in crash investigation, but I think their efforts have been thwarted by commercial politics.
Maybe a review of procedure and interference is called for - the Oil industry will no doubt ask Mr Chilcot to carry it out
