Sean Lock and Joe Wilkinson take on Jon Richardson and Sara Pascoe. Sam Simmons is in Dictionary Corner, while maths whizz Rachel Riley looks after the letters and numbers.

Sean Lock and Katherine Ryan take on Jon Richardson and Joe Wilkinson. Adam Riches as Sean Bean is in Dictionary Corner.

Jimmy Carr hosts as Sean Lock and Joe Wilkinson take on Jon Richardson and Kiri Pritchard-McLean. The Brett Domino Trio join Susie Dent in Dictionary Corner.

Jimmy Carr hosts as Jon Richardson and Lucy Beaumont take on Roisin Conaty and Joe Wilkinson. Bec Hill joins Susie Dent in Dictionary Corner.

Jon Richardson and Joe Wilkinson take on Lee Mack and Katherine Ryan. Brett Domino is in Dictionary Corner. Jimmy Carr hosts, with Rachel Riley and Susie Dent.

Jimmy Carr hosts as Lee Mack and Joe Wilkinson take on Jon Richardson and Jessica Knappett. Comedian Nigel Ng is in Dictionary Corner. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate

Jimmy Carr hosts with Rachel Riley and Susie Dent. Jon Richardson and Lucy Beaumont take on Richard Ayoade and Joe Wilkinson and Finlay Christie finds himself in Dictionary Corner.

Jimmy Carr hosts the words and numbers game show mash-up, with Countdown regulars Rachel Riley and Susie Dent. Jon Richardson and Jo Brand take on Joe Wilkinson and Jamali Maddix. Rachel Parris is in Dictionary Corner.

Jimmy Carr hosts the words and numbers game show mash-up, with `Countdown' regulars Rachel Riley and Susie Dent. Roisin Conaty and Joe Wilkinson play against Jon Richardson and Nabil Abdulrashid. David O'Doherty is in Dictionary Corner.