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Tory MPs have defeated a law that would have shown whether Brexit will hand £350million a week to the NHS.

The bid was voted down by 337 votes to 288 tonight despite a campaign by arch-Remainer Chuka Umunna.

The Labour MP tried to force the government to publish a report estimating how health spending will be affected after Britain leaves the EU.

He launched his bid after the £350million-a-week claim was plastered across posters and a bus by the Boris Johnson- and Michael Gove-backed Vote Leave campaign.

Yet Mr Johnson and Mr Gove were among those who voted against Mr Umunna's amendment tonight - as did Labour Leave bigwig Gisela Stuart.

Former shadow minister Mr Umunna warned the £350m claim - repeatedly shown as misleading - was "inextricably linked" to Britain's decision to leave the EU.

(Image: Getty Images) (Image: Getty Images)

He said: "In our democracy it is in this House that [MPs] are held to account for the promises and things they say to the people.

"What better way to test the resolve of people like (Iain Duncan Smith and Michael Gove)? What better way to test their resolve than for there to be a vote on this so people can see if they meant what they said?"

He added: "These people will never be forgiven if they betray the trust of the people by breaking their promise to do all they can to ensure that the £350million extra per week for the NHS is delivered."

The vote came as the government defeated a final string of amendments to Theresa May's so-called Brexit Bill after three days of debate.

The Bill will give Mrs May the authority to pull two-year EU exit trigger Article 50.

(Image: Getty)

It is expected to pass its final vote tonight after Labour MPs were ordered to back it - despite an expected rebellion.

But fury mounted as MPs complained their detailed changes were squeezed out due to a lack of time.

And the promise of a vote on the final deal was branded a "con" after it emerged Theresa May will not renegotiate her plan, even if MPs reject it.

It's been a Parliamentary drama, with Tory MPs being bussed in from their lavish fundraising ball to vote and a cancer-stricken colleague leaving hospital to join them.

One Tory rebel even compared her Hard Brexit colleagues to "jihadis" , and another covered her face in despair.