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Illustrator Quentin Blake on how he draws

11 December 2012 Last updated at 15:48 GMT

Quentin Blake's illustrations first appeared in Punch more than 60 years ago, but he is best known for his work in Roald Dahl's children's books. Now, ahead of an exhibition of his work at Marlborough Fine Arts gallery, in London, he has been speaking to BBC Newsnight's Culture correspondent Stephen Smith about how he draws.