In this much-loved Dahl story, the giraffe, the pelican and the agile monkey set out to prove that they are the best window-cleaning company around.
Roald Dahl, the best-loved of children's writers, was born in Wales of Norwegian parents. After school in England he went to work for Shell in Africa. He began to write after "a monumental bash on the head", sustained as an RAF pilot in World War II. Roald Dahl died in 1990.