I had recently graduated from Hamble when this accident occurred and the P2 and P3 were Hamble trained so it hit home fairly hard.
Like all accidents there were many holes in the swiss cheese which lined up that day. It was before the days of Mandatory Occurrence Reporting and BEA had had 2 previous near misses when the LE droop had been retracted at too low an airspeed but they'd got away with it. Reports had been made but at that time there was no legal requirement for CAA to be copied.
Therefore, it's up to the more experienced member to create an atmosphere which is conducive for the less experienced to voice any concerns.
Piltdown Man, agreed but it also takes two to tango! With all respect to new FOs (and I know how it feels since I joined as Second Officer when I was 20 years) there are some things which only come from "life" experience although robust SOPs can go a long way towards alleviating any conflicts.
It only goes to prove that even now with automation it's the humans that are key to safe operation and they can only do the best they can with the resources they have available to them at the time. Safety operation is a product of the overall system, just as any accident is. CRM is just one of the ingredients for safe operation.
Also remember that at that time pilots had no training for recognizing and dealing with pilot incapacitation - which was one of the recommendations of the Accident Report.