This is sort of a stretch for an all-Musical Best Bets, but it includes, as Norton’s guest stars, Rebel Wilson, now starring in London in the musical Guys and Dolls. So there. But the real reason is that other guests on Norton’s couch tonight include Jennifer Saunders and Joanna Lumley, all three of whom are in a new Absolutely Fabulous film, and very vintage punk musician Iggy Pop.