Plot: A special celebrity Christmas edition of the general knowledge quiz in which four teams try to come up with the answers that no-one else could think of. The show is presented by Alexander Armstrong and co-host Richard Osman, and it features Justin Hawkins and Dan Hawkins, Gareth Malone and Samantha Stevenson, Jimmy Osmond and Ben Haenow, as well as Mike Batt and Jona Lewie