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).

Sean Lock, as well as being an acclaimed stand-up for many years, has also written for other comics, including Bill Bailey, Lee Evans and Mark Lamarr, and his profile has risen hugely through his stints as team captain on 8 Out of 10 Cats on Channel 4 and regular guest appearances on other panel shows, including QI and Mock the Week. His fans, including me, recall with fondness his sitcom 15 Storeys High, which ran for two series on BBC TV (and which was developed from the equally funny Radio 4 show Sean Lock’s 15 Minutes of Misery).