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It's not every day you get a letter sent to you directly from the Prime Minister, so imagine Dara O Briain's surprise when one landed on his doormat.

But the comedian and TV presenter was probably even more shocked when he opened the letter and spotted an embarrassing gaffe.

The letter doesn't claim to be from Downing Street, but instead huge font at the top of the letter announce it's from 'Rt. Hon Theresa May Prime Minister'.

Dara didn't disclose why the Prime Minister was writing to him personally but you can just see - in huge, capital, bold lettering - the words 'making Brexit a success is central t-' before the note is cut off.

This comes after an awkward mistake at the top of the letter...

Unfortunately, 'Theresa' had addressed the letter 'Dear Dara and Briain'.

Erm, Theresa, who exactly is Briain?

(Image: Rex Features)

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Dara shared a photograph of the letter on Twitter, saying: "Oh my! A personal letter from the Prime Minister! ...Wait, what?"

Clearly the letter is not from May herself and was a mistake by the computers which generate such 'personal' letters, substituting 'O' for 'and'.

It's presumably a mass-produced letter sent to thousands of voters and not at all personal correspondence, but ties in with the Tories' campaign to make May the face of the election rather than focusing on the Conservatives as a party.

Someone else even had the same problem.

It prompted a flurry of amused replies from fellow comedians, with David Baddiel questioning: "Sorry, you're saying you're NOT two people?

And then there was this gem

There's even a name for it

Better get that computer fixed, Theresa.