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Contestants from Leeds, Pontypool, Norfolk, Belfast, Derbyshire & London take on five rounds of fiendish puzzles as they attempt to qualify for the series Grand Final.
Contestants from Thetford, Oxford, Powys, Staffordshire, Nottingham and Porth take on five rounds of fiendish puzzles as they attempt to qualify for the series Grand Final.
Six contestants from around the UK have made it to the play-off and will take on five rounds of fiendish puzzles as they attempt to qualify for the series' grand final. Lucy Worsley asks the questions.