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Labour’s most senior MPs are to put an extraordinary deal to Jeremy Corbyn to keep the party together.

And it would stop him from pursuing any loony left policies which risk ripping it apart.

Shadow Cabinet ministers are now resigned to Mr Corbyn becoming leader when votes are counted next week.

But they have agreed to give him 18 months to prove to them he is up to the job.

If he is not, they will force another leadership contest to oust him.

They also want Labour’s new policies to be put to a vote of shadow ministers so nothing too extreme gets through.

That could stop Mr Corbyn committing the party to Britain scrapping Trident nuclear missiles, leaving Nato or mass nationalisation.

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One shadow minister told the Sunday People: “It’s important we don’t walk away but serve in Jeremy’s team.

“This is about saving the Labour Party . It will keep MPs onside with the leader and the leader onside with MPs.”

The plan is to go back to elections for the Shadow Cabinet, a policy abandoned by Ed Miliband in 2011 when he was leader.

That would ensure Labour MPs have a say on the people at the top.

And the double lock will be to only make Mr Corbyn’s proposals official policy when a majority round the Shadow Cabinet table are in favour.

Shadow ministers think Mr Corbyn could warm to the idea because he has spoken up for more party democracy.

And as he only has the support of 20 Labour MPs at most, he needs to keep the others sweet to avoid civil war.

Labour insiders say Mr Corbyn has been able to outflank rivals Andy Burnham, Yvette Cooper and Liz Kendall by galvanising support from the People’s Assembly Against Austerity he helped to found in 2013.

The pressure group is backed by major unions Unite, Unison and RMT and the Green Party.

It has organised mass rallies across Britain and formed anetwork of local campaigning groups.

Last year organisers were able to muster 50,000 protestors for a demo in central London.