The main point is bast0n, that a large number of people on this thread are not convinced that the "no doubt whatsoever" burden of proof has been met.
They include experts in Chinook flying and Airworthiness.
Their combined experience trumps yours, mine , Cazatou, Wratten and Day by a considerable margin.
Cazatou,
Breakfast negligence, Flight Planning negligence, Crew Duty negligence.
Now we have Listening to the Radio negligence.
What next?
What was the Regional QNH? What was set?