SAJID Javid tonight sunk Theresa May’s controversial Brexit customs plans by siding with Cabinet leavers at a crunch meeting of the PM’s war committee.

The new Home Secretary stunned the Prime Minister by declaring he was “the new kid on the block” as he shredded her Customs Partnership plans at the three hour showdown.

5 Sajid Javid sunk Theresa May's Brexit customs plans tonight

The ex-Remain supporter tipped the balance of the 11 strong committee just three days after being appointed, leaving Mrs May looking “visibly shocked to have lost the room” according to one insider.

The PM was lobbying for a customs partnership solution where the UK collects duty on behalf of the EU, but Mr Javid said the flawed plan would hinder Brexit Britain trading around the world - to the delight of Brexiteers.

Tonight, No10 sources admitted Mrs May’s preferred plan could not go forward in its current form after the furious Cabinet and public backbench opposition.

And Mrs May tasked her officials with going back to the drawing board and “refining” how Britain’s customs and trade relationship will work with the EU and avoid a hard border with Ireland.

5 The new Home Secretary declared he was the 'new kid on the block' Credit: Reuters

5 No 10 sources admitted Mrs May’s preferred plan could not go forward in its current form

Brexit negotiator Olly Robbins and his team are expected to come forward with amended proposals swiftly so that ministers can try arrive at a preferred option possibly as early as next week.

Cabinet Brexiteers David Davis, Boris Johnson, Liam Fox and Michael Gove favour a ‘Max Fac’ proposal where smart cameras and pre-registration is used to monitor goods crossing the Irish border.

And tonight they won the crucial backing of Mr Javid and Defence Secretary Gavin Williamson, who also said he had “grave concerns” about Mrs May’s solution.

That left the PM, Chancellor Philip Hammond, Business Secretary Greg Clark and Northern Ireland Secretary Karen Bradley outnumbered.

5 Sajid Javid secured the job of Home Secretary on Monday Credit: SWNS:South West News Service

It is understood that Cabinet Office Minister David Lidington also sided with the PM’s torpedoed plan.

The No10 climbdown came after a day of bitter sniping at Theresa May from vocal backbench critics.

Mrs May was branded a “corpse” by furious Eurosceptic Tories today as they warned a betrayal over EU customs would trigger a flurry of letters demanding a leadership contest.

Tories seething at No.10 said a “number” of Brexit backers were ready to pen letters to Tory backbench boss Sir Graham Brady – formal demanding a contest for a new leader.

5 Theresa May was branded a 'corpse' by furious Eurosceptic Tories Credit: Reuters

They told The Sun that even Tories in marginal seats believed a change – as they believe an election could take place this OCTOBER due to Brexit deadlock.

It followed the revelation that 60 Tory Eurosceptics have sent the PM a 30 page report detailing their opposition to the plan for a post-Brexit customs partnership with the EU.

One stormed: “No.10 should have seen this coming. People have been in to see Theresa May in the last 24, 48 hours and see just sits there and doesn’t say anything.

“She’s like a corpse, all the blood has drained out of her. If they do this people are going to start putting in more letters to Graham Brady.”

MOST READ IN POLITICS WINTER COMING England may have to ban home visits too as SAGE adviser warns lockdown coming Latest DOWN TO BUSINESS Chancellor to launch 'furlough replacement' tomorrow as Budget CANCELLED LOCKED UP AGAIN New lockdown rules explained: Everything you can and can't do now Latest 'PERILOUS POINT' PM warns stricter rules likely to last 6 MONTHS ruining Xmas for millions REBEL ALLIANCE Boris Johnson faces major Tory rebellion over new lockdown rules COVER UP Boris doubles face masks fines to £200 and forces pubgoers to wear them

Tonight Labour MP Stephen Doughty blasted: “The Government’s negotiation with itself is going about as well as its negotiations with the EU.

“With less than six months to go before the final Brexit deal is supposed to be agreed, Ministers are still fighting among themselves about which of their two discredited customs proposals to persist with.”

And the pro-EU best for Britain campaign said the PM must “get a grip and lead in the national interest.”