It's the penultimate stage of the competition, and the stakes are high as the ten do battle for the six places in the final. They face two challenging rounds: Spelling, a gruelling test of some of the hardest words in the English language; and General Knowledge, where they must answer questions on a vast range of topics from astronomy to geography.
Eleven-year old Sophie is an A-star student from Essex, whose dinner lady mum takes a relaxed approach to her child's brilliance.
Cuneyd is a 12-year-old science prodigy from London who was diagnosed with Asperger's syndrome when he six.
Can 11-year-old Eleanor hold it together long enough to get through to the final, and will eight-year-old Tudor's many hours of supervised preparation be enough to guarantee him a place?
