"Recently I was in Berwick Street, Soho, where I often work, when a man said to me outside a studio: "I'll never forgive you for what you did to our grammar schools." The man looked extremely respectable and I said to him: "What did you say?" And he said: "I'll never forgive you for what you did to our grammar schools, and neither will my wife." I was suddenly very irritated with him: "What are you talking about, you silly bugger, what have I done to grammar schools?" My aggression obviously startled him, for he looked at me rather more carefully, cleared his throat and said, "I do beg your pardon, I thought you were Shirley Williams," and he went off muttering."
January 1, 1970
https://en.wikiquote.org/wiki/Shirley_Williams