Boris Johnson was in a south Hampstead suburb, during the mayoral election, and this very attractive, relatively middle-aged woman came to the door and said:
"Boris, good to see you. Really lovely to see you. You are the father of one of my children.'"
And the white hair stood up on end and I remember the words that came out: "Cripes, Oh god, Oh cripes."
This went on for about ten minutes.She said: "Boris, you are the father of one of my children."
And he said. "Do the media know? What is it? Is it money?"
She said: "No you're the father of one of my children. I'm her maths teacher."