Jimmy Carr hosts a festive edition of the combination of the comedy panel show and the long-running words and numbers quiz, with Sean Lock and Bob Mortimer taking on Jon Richardson and Lucy Beaumont. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate with guests Adam Buxton and Joe Wilkinson.

Sean Lock and Katherine Ryan take on Jon Richardson and Joe Wilkinson in the classic words-and-numbers quiz, while Adam Riches as Sean Bean joins Susie Dent in Dictionary Corner. Hosted by Jimmy Carr, with regular Countdown mathematician Rachel Riley looking after the numbers and letters.

Sean Lock and Harriet Kemsley take on special guest team captain Alan Carr and Catherine Tate, while Adam Buxton joins Susie Dent in Dictionary Corner.

Sean Lock and Sara Pascoe take on special guest team captain Alan Carr and Tom Allen in the classic words-and-numbers quiz, while Rosie Jones joins Susie Dent in Dictionary Corner. Hosted by Jimmy Carr, with regular Countdown mathematician Rachel Riley looking after the numbers and letters.

Sean Lock and Rob Beckett take on special guest team captain Alan Carr and Sarah Millican. Nick Mohammed is in Dictionary Corner with Susie Dent. With Jimmy Carr and Rachel Riley.

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 Victoria Coren Mitchell take on Jon Richardson and James Acaster, while Morgana Robinson joins wordsmith Susie Dent in Dictionary Corner.

Sean Lock and Miles Jupp take on Jon Richardson and Rose Matafeo, while Vic Reeves joins Susie Dent in Dictionary Corner. Hosted by Jimmy Carr, with regular Countdown mathematician Rachel Riley looking after the numbers and letters.