Jimmy Carr hosts a special Christmas edition of 8 Out Of 10 Cats Does Countdown, packed with festive surprises. Joe Lycett and Danny Dyer take on Jon Richardson and Roisin Conaty. Rachel Riley looks after the letters and numbers, and Mr Swallow (Nick Mohammed) joins Susie Dent in Dictionary Corner. And as a Christmas treat, Cats Does Countdown royalty Joe Wilkinson is back to help/annoy Rachel.