OXFORD author Sir Philip Pullman has added his views to the debate about the new Brexit coin by criticising the lack of an ‘Oxford comma’.

Three million coins bearing the slogan ‘Peace, prosperity and friendship with all nations’ are due to enter circulation from Friday when Britain leaves the EU.

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The His Dark Materials author tweeted: “The ‘Brexit’ 50p coin is missing an Oxford comma, and should be boycotted by all literate people.”

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The Oxford, or serial comma is included before the final ‘and’ in lists.

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Earlier this month Sir Philip got involved in the debate about the media's treatment of Meghan Markle when it was announced she and Prince Harry would be stepping back from Royal duties.

He tweeted: “Of course Meghan Markle is attacked by the British press because she’s black, and of course Prince Harry is right to defend her. What a foul country this is.”

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The author’s contribution prompted numerous responses, with some followers criticising him for bringing race into the argument.

Sir Philip is renowned for his fantasy fiction. He also tweets and has 152,000 followers on the social media platform.

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Last year he deleted a tweet in which he said he said he thought of the word 'rope' and 'nearest lamp post' when he heard Boris Johnson's name.

He deleted the tweet and insisted he did not advocate hanging Boris Johnson.

In 2017, La Belle Sauvage the first instalment of the new Book of Dust trilogy, was a publishing sensation.

The follow-up, The Secret Commonwealth, came out last year.

The first series of a TV adaptation of His Dark Materials was screened on BBC1 at the end of last year.

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Starring Dafne Keen as Lyra, and Ruth Wilson as Mrs Coulter, it won critical acclaim and a second series is being made.