While many grown ups would recognise David Walliams from his television comedies such as Little Britain and Come Fly with Me, he is also a successful children's author.
His writing, which has been compared with that of Roald Dahl, has won him hordes of young fans. His latest book is entitled 'Ratburger', and it's about a girl called Zoe and her pet rat.
Lynn Freeman asks David Walliams about his duel careers, and what he was like when he was the same age as many of the characters in his books.
