NIGEL Farage has warned that the historic Brexit vote could be dramatically overturned - because Leavers have stopped fighting their corner.

The warning came as a group of leading economists warned that failing to strike a deal with Britain could cost the EU £500bn.

2 Nigel Farage warned that Brexit is in danger as Leave have stopped making arguments for exiting the EU Credit: AFP or licensors

The former UKIP boss said that Britain's decision to leave the EU could be vulnerable to establishment-backed campaigns and a cabal of Europhile MPs.He told The Observer: "The Remain side are making all the running.

“They have a majority in parliament, and unless we get ourselves organised we could lose the historic victory that was Brexit.

“The Leave groups need to regather and regroup, because Remain is making all the arguments.

"After we won the referendum, we closed the doors and stopped making the argument.

2 Nigel Farage last week called for a second referendum on Brexit

“We no longer have a majority in parliament. I think we would lose the vote in parliament."

The admission came as the Economists for Free Trade group predicted that Britain will gain £651bn from walking away from talks, leaving the EU with a hefty £507bn bill.

Last week Mr Farage sensationally opened the door for another vote on our EU exit.

He said: “What is for certain is that the Cleggs the Blairs will never ever, ever give up. They will go on whinging and whining and moaning all the way through this process.

Anti-Brexit united call By David Wooding, Sunday Political Editor LABOUR is being urged to join an anti-Brexit plot to keep Britain in the single market and customs union. The SNP, Lib Dems, Plaid Cymru and Greens are backing an amendment to the EU Withdrawal Bill this week. It would stop ministers from ending free movement and other EU rules once we leave. Lib Dem leader Sir Vince Cable said: “We urge Labour to join us.” Meanwhile, rookie Tories overlooked in the reshuffle have threatened to back any future leadership challenge.

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“So maybe just maybe we should have a second referendum on EU membership."

But within hours he appeared to row back, insisting he didn't want a second referendum and was merely trying to galvanise Leave campaigners to the inevitably of one.

Tory MP Nigel Evans said: “Poor old Nigel. I know we have not seen much of him he’s like a fruit machine in a pub - if no one plays it for a while it springs into action with an irritating noise."

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