Jimmy Carr hosts as Roisin Conaty and Kiri Pritchard-McLean take on Jon Richardson and Rob Beckett. Comedian Huge Davies is in Dictionary Corner. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate

Jimmy Carr hosts with Countdown regulars Rachel Riley and Susie Dent as Jack Dee and Tom Allen take on Jon Richardson and Judi Love. Dr John Cooper Clarke is in Dictionary Corner.

Jimmy Carr hosts, as Roisin Conaty and Asim Chaudhry take on Jon Richardson and Josh Widdicombe. Bill Bailey is in Dictionary Corner. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate

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 Countdown regulars Rachel Riley and Susie Dent as Sarah Millican and Nish Kumar take on Jon Richardson and Maisie Adam. David O'Doherty joins Susie Dent in Dictionary Corner.

Jimmy Carr hosts with `Countdown' regulars Rachel Riley and Susie Dent as Sean Lock and Harry Hill take on Jon Richardson and Rosie Jones. Mr Swallow, aka Nick Mohammed, is in Dictionary Corner.