On the Nostalgia forum is this link:
https://www.aerosociety.com/news/aud...he-boeing-727/
It leads to audio interviews with respected acceptance test pilot DPDavies (who wrote the book Handling the Big Jets).
If you are prepared to listen to all the audio about his flights in the V bombers and Concorde, you then get his unwashed straight opinion on the FAA and CAA effectivity and honesty at that time.
It makes for thought provoking listening - years ago of course but very pertinent to this discussion.