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Quizmaster Richard Osman puts the remaining 13 competitors through a general knowledge round including arts, science, history and UK rail stations.
It's the demanding Maths and Memory round, featuring Mog, who entered all by himself, and Christopher, who's been in training with his dad Simon for three years.
It's the semi-final stage and quizmaster Richard Osman tests the remaining ten competitors on language, comprehension and a gruelling round of spelling.