Alexander Armstrong and co-host Richard Osman present a special celebrity edition of the quiz that tests the depths of your general knowledge. These celebrities try to come up with the answers that no-one else could think of.

Featuring Ulrika Jonsson and Rowland Rivron, David Hamilton and Tony Blackburn, Austin Healey and Scott Quinnell and Tim Vine and Karen Taylor.

Alexander Armstrong and co-host Richard Osman are joined by children's television stars for a special celebrity edition of the quiz that tests the depths of your general knowledge. These celebrities try to come up with the answers that no-one else could think of.

Featuring Sarah Greene and Mike Smith from Saturday Superstore, Grange Hill's Erkan Mustafa and Lee MacDonald, The O-Zone's Jamie Theakston and Jayne Middlemiss, and Blue Peter presenters Peter Duncan and Mark Curry, with special guest Keith Chegwin.