This is the first gig I have attended where a sign at the door states: “First act - long. Second act - even longer”. So we have been warned, and as soon as Ken Dodd takes to the stage he refers to his (by now) legendary ultra-lengthy shows. “This evening will be a test of bladder strength,” he tells us, and proceeds to entertain almost non-stop for the next four hours (he has been known to do five or six).