" Compared with the cost of a fatal accident..."
My employers lost two Hermes in a few months in 1956, one with 7 of the 80 on board killed. Training was not a factor. Fatigue was, at least in the fatal one.
After Questions in Parliament, Flight Time Limitations were introduced for U.K. aircrew.
First Officers were trained to Group 1, so they could operate as Second Captains on a heavy crew.
( My training as a First Officer had taken 80 minutes flying for Group 2 )
THAT WAS THEN !
(We were told that the Insurance premium had been increased, to cover their losses.)