Mastermind 2013/14 Episode 20 Episode 20 ( Air Date 2014-01-24 ) Genre Talk category. Overview "Host John Humphrys invites four more contenders to answer questions in the black chair. Subjects are Charles Rennie Mackintosh, Sam Phillips and the Sun Record Label 1950-1960, the Sharpe novels of Bernard Cornwell and Alfred Wainwright's Pictorial Guides to the Lakeland Fells.".