Tom Heap, Jo Caulfield, Lutalo Muhammed, Stuart MacBride

Four more famous faces put their reputations on the line as John Humphrys tests them on their specialist subjects and general knowledge. In the black chair are Countryfile reporter Tom Heap on the Godfather Trilogy, comedian Jo Caulfield on the history of Edinburgh, Olympic taekwondo silver-medalist Lutalo Muhammad on boxer Jack Johnson and crime author Stuart MacBride on AA Milne.