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It was Roald Dahl day on Wednesday - when many schools across the country ask children to dress up as their favourite Dahl character and wear something yellow - the author's favourite colour.

Quentin Blake illustrated all but one of his books - his last The Minpins. So to coincide with what would have been Roald Dahl's 101st birthday it has been reimagined by the illustrator and republished as Billy and the Minpins.

Roald Dahl's widow Liccy and his biographer Donald Sturrock spoke to Sarah Montague about the author's great appeal and his relationship with Quentin Blake.

(Image: Roadl Dahl. Credit: Getty Images)