Yoko thinks I either have a kidney stone or testicular cancer, given a recent bout of pain. St Stephen, after whom I am named, was stoned. About testicular cancer, Yoko says it's a good kind of cancer. Very curable. I look at her slightly angry. I'd rather not jump to the conclusion that I have cancer, not even a very curable kind. Don't say that. To the GP — they will solve this mystery, I'm sure.