What Happens If Jeremy Corbyn Wins

This week he has been out campaigning and so far has had supporters rallying out on the streets of London and crowds out in Leeds as he presents his 2020 Vision for Britain.

In it he has set out his plans for the North to combat George Osborne's "Northern Powerhouse" - essential for bringing back some of that core Labour support that deserted under Ed Miliband.

His team is getting ever slicker and his campaign is gathering momentum. Polls have put him in the lead - by some way.

So if team Corbyn triumphs come 12 September, what could happen?

1) The Labour Party splits

There have been threats that a Corbyn victory would lead to a 1980s-style spilt within Labour - the right of the party potentially joining with the Lib Dems or forming their own party.

While many frontbenchers such as shadow chancellor Chuka Umunna, shadow defence secretary Vernon Coaker and shadow home secretary Yvette Cooper have said they would refuse to serve under him, a spilt seems unlikely.

If Mr Corbyn, receives a large share of the membership vote, he will have a mandate.

Labour is a tribal party and Liz Kendall may well have summed up that loyalty when she said she could no more leave the Labour party than "her own family".

2) The party shifts significantly to the Left

Often described as a left-wing militant, Mr Corbyn will certainly put radical socialist ideals at the core of the Labour Party.

Mr Corbyn opposes continued austerity, arguing for higher levels of public spending, nationalisation of the railways and opposes renewing Trident.

He also wants the removal of the £93bn worth of corporate tax relief and subsidies. 

On his rivals, he says: "They are not offering a clear enough alternative on the economic strategy and austerity, and our attitude to welfare expenditure."

3) More control by the Unions

It was the unions wot won it.

If Mr Corby wins, the unions will have played a significant part in his victory, he currently has the backing of the RMT, ASLEF, Unison and the UK’s largest union Unite.

Unite said Mr Corbyn won its backing "in recognition that his policies were most closely aligned with those of Unite".

And while the unions are expected to have less influence on this year's contest, because the party has moved to a one member, one vote system for choosing its leader, having signed up tens of thousands of members, their support could prove crucial.