Although the least known of them today, Michael Redgrave was one of that great quartet of actors who dominated the English stage in the middle of the past century, the others being Laurence Olivier, John Gielgud and Ralph Richardson. Their peer at the time, Redgrave today brings to mind only a few famous roles, such as his lead in Hitchcock’s “The Lady Vanishes.” This is probably because he never had a very distinguished film career and, at one point, took nine years off from performing the great classical roles that made the others’ reputations.