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Text and details from Theresa May's key Brexit speech were inadvertently revealed today when a senior civil servant was photographed holding it on Downing Street.

The Prime Minister is due to deliver the speech next Friday in Florence, Italy.

But the opening line appeared to be revealed by Oliver Robbins, the Brexit Secretary's chief civil servant.

The document, which was partially obscured by Robbins' notebook, is titled: "FLORENCE WORKING DRAFT"

It reveals the PM's speech is set to be just shy of 5,000 words long.

(Image: Steve Back)

And the opening line of the speech appears to read: "I am delighted [to be in Florence], a city that taught us what it was to be European."

It's not the first time confidential Brexit details have been revealed by careless officials forgetting Downing Street snappers have very long lenses.

(Image: Barcroft)

In March, a staffer carelessly brandished meeting notes from a Brexit departmental meeting apparently revealing the Government's 'have cake and eat it' negotiating strategy for leaving the EU.