Roisin Conaty, Joe Wilkinson, Nabil Abdulrashid, David O'Doherty

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.