Jimmy Carr hosts and regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate as Jon Richardson and Jo Brand take on Joe Wilkinson and Jamali Maddix. Rachel Parris is in Dictionary Corner.

Jimmy Carr hosts the comedy words-and-numbers quiz as Roisin Conaty and Joe Wilkinson take on Jon Richardson and Nabil Abdulrashid. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate, aided by David O'Doherty in Dictionary Corner.