Maria Nikolajeva, professor of children's literature at the University of Cambridge, disputes the notion that there is any darkness in Dahl’s books for younger readers. Female characters tend to be either warm or wicked with nothing in between, while Revolting Rhymes brands Cinderella, that fairytale girl-next-door, “a dirty slut”. Charlie and the Chocolate Factory’s Oompa Loompas were originally depicted as small black pygmies with warlike cries. Teachers tend to be villainous, and even when benign, fail to impart any real wisdom.

If he was a bigot, he was an equal-opportunities bigot. It’s easy to poke fun at such prissy parental responses but take a closer look at Dahl’s writing for children, and you’ll find something to offend almost everyone. In the decades since its publication, James and the Giant Peach has been lambasted for its racism (remember that bit where the Grasshopper declares “I’d rather be fried alive and eaten by a Mexican”?), profanity (‘ass’ appears at least three times), references to drugs and drink (all that snuff and whiskey), and sexual innuendo (a scene in which a spider licks her lips got readers in Wisconsin hot under the collar), not to mention its alleged promotion of disobedience and – wait for it – communism.

The controversy has never gone away though. All told, his work has sold more than 200 million copies worldwide. Today, titles like Fantastic Mr Fox, The BFG and Matilda, which was released just two years before his death, aged 74, in 1990, regularly appear on lists of the most popular kids’ books ever.

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