The children's book programme introduced by Penelope Lively lam very childish, and I enjoy my own jokes. But not too much - because making people laugh is a very serious business.
He's consistently voted top writer by children - yet some libraries have banned him, and he's often criticised for his seeming cruelty and vulgarity. Julia Eccleshare meets
Roald Dahl , and discovers the motivation behind the magic. Producer SALLY FELDMAN