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Jeremy Corbyn's odds to be the next Labour leader have been slashed to just 10/3 after a punter placed a £1,000 bet.

It's the latest coup for the radical left-winger - who last month was a 100/1 outsider - after private Labour polling reportedly put him in first place .

Shocked centre-ground MPs are calling on grassroots members to vote for a less left-wing candidate between Yvette Cooper, Liz Kendall and Andy Burnham .

Mr Burnham remains the favourite with bookies Ladbrokes with odds of 10/11, followed by Shadow Home Secretary Ms Cooper on 11/4.

But Mr Corbyn, an MP since 1983 who's rebelled against his party more than 500 times including over the Iraq war, has long since leapfrogged Ms Kendall's odds.

Labour leadership hustings LIVE: Contenders face TV debate on BBC's Sunday Politics

(Image: Getty)

She's now trailing on 10/1 after Mr Corbyn attracted a four-figure mystery bid.

Labrokes said he is 'the only man punters want to back at the moment', including a £1,000 stake at 7/2 which led his odds to be cut again.

Spokesman Jessica Bridge added: "The support for Corbyn is relentless.

"It's consequently left favourite Burnham drifting like a barge.

"If the money continues to pour in it's only a matter of time before Corbyn moves into second spot in the betting."

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Tony Blair's former culture secretary Ben Bradshaw dismissed the claims today, saying the debate is being skewed by people who 'shout the loudest'.

He told Sky's Dermot Murnaghan: "It's very important that Labour party members think very carefully about what they're about to do.

"They voted overwhelmingly for David [Miliband] last time.

"I think it would be a mistake to assume that the minority of members who attend meetings to nominate or who make the most noise at hustings are representative of the wider membership.

"I don't think Jeremy's going to win so all of these questions are hypothetical."