Some of the UK's cleverest ten- and 11-years-olds compete in a junior version of the quiz, showing weeknights with the final next Saturday. Specialist subjects are The Vicar of Dibley, Eoin Colfer's Artemis Fowl novels, archaeologist Howard Carter and Winston Churchill. With John Humphrys. Alan Titchmarsh in the chair

Dolphins, the Beatles, the complete works of Beatrix Potter and the life and career of Alexander Graham Bell are the specialist subjects.

Eclectic specialist subjects tonight are Enid Blyton's Famous Five books; the history of Cadbury; Egyptian deities; and the Back to the Future movies. Presented by John Humphrys.

John Humphrys quizzes four more ten- and 11-year-olds. Tonight's subjects are the history of the English longbow, the Star Wars films, black holes and the Philip Pullman trilogy His Dark Materials.

Specialist subjects in the last heat are the Plantagenets; the life and career of Michael Schumacher; Fawlty Towers; and the films of Hayao Miyazaki. The final is tomorrow. Alan Titchmarsh in the chai

Pint-sized brainboxes battle it out in the quiz's climax. Specialist subjects are Lemony Snicket's A Series of Unfortunate Events books, Paul Cezanne, Roald Dahl, The Simpsons, the House of Stuart, and the Darren Shan novel series. With John Humphrys.