In this 1989 TV programme, Simon Callow introduces rare interview clips with Ralph Richardson, Sybil Thorndike, Albert Finney, John Gielgud, Noel Coward, Edith Evans, Michael Redgrave, Richard Burton, Laurence Olivier, Vanessa Redgrave and Maggie Smith.
Simon is also a great admirer of Charles Laughton and wrote an excellent bio of him sub-titled "A Difficult Actor." Here too is his 1987 TV documentary entitled "Callow's Laughton" ...
https://www.youtube.com/watch?v=w2w9tCioxUM&t=368s