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Tory David Davis had a 'Thick of It' moment this morning, as his party's 'bombshell' poster backfired horribly.

The party were launching their "tax bombshell" poster, which claims Labour have a £45 billion hole in their financial plan - a claim branded 'lies' by John McDonnell.

But the bumbling Brexit Secretary managed to stand in exactly the wrong place - and may have given away a more honest appraisal of the Tories' management of the economy.

"Hell for your family. Debt. Taxes."

And Labour managed to derail the event even further by sneaking in to the event, smuggling a rebuttal document to reporters, which said the poster is full of "mistakes, misinformation and misrepresentation."

This morning, Shadow Chancellor John McDonnell branded the poster "absolute lies", pointing out the £45 billion figure includes £35 billion in capital spending.

Labour say the Tories have "fundamentally misunderstood" the difference between day-to-day revenue spending - ongoing expenses which have to be paid for immediately - and longer term capital projects, which do not.

Labour's Andrew Gwynne said: "That Philip Hammond is willing to put his name to this nonsense is deeply worrying given it suggests he’s unable to tell the difference between capital and revenue spending."

And despite warning of a tax bombshell under Labour, Hammond repeatedly refused to rule out dropping a tax bombshell of his own.

He refused to confirm the party would maintain a 'triple lock' on increases to taxes and national insurance, insisting details of their tax and spending plans would be revealed in the manifesto.

(Image: Internet Unknown) (Image: REUTERS)

The poster fail recalled the moment in the BBC comedy The Thick of It, where beleaguered cabinet minister Nicola Murray is maneuvered into standing in front of a poster advertising a candidate called Liam Bentley, with disastrous results.