Steve, your post reminds us that a lasting legacy of the Trident was that on completion of the autoland proving trials, the company found themselves with a redudent 64 channel data recorder on the entire fleet. This data could have been used in a variety of ways, some of them harsh & disciplinarian. However, BEA and BALPA came up with the enlightened SESMA programme which in my view is one of the greatest single contributors to air safety.
Then again Papa India, the main cause of which was the Tridents big design flaw - not incorporating flap & droop into a single lever, brought about the introduction of CVR