By coincidence, there is a story in the Guradian today about the writing of "Absurd Person Singular". I particular like the comment from the actor Christopher Godwin who played Ronald Brewster-Wright in the original production:
"I remember having trouble with a speech. I was doing it very
emotionally, and Alan told me, "You're forgetting you're English." He
was right: the English don't expose themselves emotionally; they imply,
which can be much more bleak."