Jim,
I did say that judging by the few clips I heard in the programme. It appeared to me that Ewan was telling people how it should be done. I think at one time he said that singers are actors or should be actors(?).
You are not alone in having met and recorded veterans who had been singing all of their lives. I too among many others have done the same including Walter Pardon on three or four occasions, and some of us for more than thirty years. I first met Peggy in 1957 and 1958 until she had to go to France and heard her and Ewan regularly until about 1961. I always enjoyed listening to her and learning from her. Ewan I did not enjoy very much but agree that he wrote some very good songs and made some good radio programmes. I didn't particularly like his attitude but that is not a snide remark it is purely the way I felt about the man. I don't remember making snide remarks about Peggy either.
Perhaps there are some singers who will tell us if their singing benefitted from Ewan's/the group's advice.

Hoot