Richard Brittain was the overall champion of Series 55. He accumulated 820 points in his Octochamp run, but went into the finals as second seed to Steven Briers (840 points). Steven Briers however then narrowly lost his quarter-final against eighth seed Phil Watson, a match which Brittain, watching from the audience, called 'an enthralling spectacle'. Brittain then comfortably won his quarter-final against Andrew Blades, but only narrowly beat Stu Horsey in the semi-finals before he trounced an off-form Tony Warren in the final, 103 – 60.
He returned for the Championship of Champions XIII and faced one of the favourites Jon Corby, and lost with the lowest score in the competition, including the disallowed words ODONTAL, BIOPOT ☓, OMMIT ☓, SALONEEN ☓, and his now famous conundrum offering GANDISEEG ☓.
Richard Brittain also appeared on the now-defunct gameshow Brainteaser in January 2007, less than a month after winning Countdown. He won the show and pocketed £1500.
|#||Date||Type||Contestant 1||Score||Contestant 2||Guest||Lex||Max|
|4188||11/09/2006||P||Sarah Duncan||67 – 116||Richard Brittain||Pam Ayres||Susie Dent|
|4189||12/09/2006||P||Richard Brittain||94 – 83||Claudia McQue||Pam Ayres||Susie Dent|
|4190||13/09/2006||P||Richard Brittain||95 – 77||Gil-Ad Schwartz||Pam Ayres||Susie Dent|
|4191||14/09/2006||P||Richard Brittain||105 – 68||Ali Ashman||Pam Ayres||Susie Dent|
|4192||15/09/2006||P||Richard Brittain||100 – 82||Henry Smith||Pam Ayres||Susie Dent|
|4193||18/09/2006||P||Richard Brittain||96 – 62||Jim Foster||Phil Hammond||Susie Dent|
|4194||19/09/2006||P||Richard Brittain||98 – 31||Anne Devlin||Phil Hammond||Susie Dent|
|4195||20/09/2006||P||Richard Brittain||116 – 66||Paul Manning||Phil Hammond||Susie Dent|
|4257||15/12/2006||QF||Andrew Blades||52 – 96||Richard Brittain||Ken Bruce||Susie Dent|
|4261||21/12/2006||SF||Richard Brittain||83 – 75||Stu Horsey||Paul Zenon||Susie Dent|
|4262||22/12/2006||GF||Tony Warren||60 – 103||Richard Brittain||Paul Zenon||Susie Dent|
|4735||14/01/2009||CP||Jon Corby||92 – 52||Richard Brittain||Andrew Sachs||Susie Dent|