Child Genius

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.

Quizmaster Richard Osman puts the remaining 13 competitors through a general knowledge round including arts, science, history and UK rail stations.

It's the semi-final stage and quizmaster Richard Osman tests the remaining ten competitors on language, comprehension and a gruelling round of spelling.

Quizmaster Richard Osman tests the five gifted finalists in their specialist subjects. The last two standing then advance to the head to head final round as they battle for the title.