Jonathan Ross, David Walliams, Katherine Ryan, Aisling Bea, Noel Fielding and Richard Ayoade join Jimmy to compete for the Big Fat Quiz crown. Jonnie Peacock drops by to test the panel's sporting memories, and The London Philharmonic Choir are on hand to add a touch of class. Jimmy is ably assisted by Big Fat favourites Jon Snow, Mitchell Brook Primary School and Joey Essex, as well as a whole host of celebrity question setters. So what diet did William the Conqueror attempt? What is Bill Gates's hidden talent? And why do tennis players wear white?