Will Labour’s Vale politicians be voting for Jeremy Corbyn?

London mayoral hopeful Diane Abbott, one of Mr Corbyn’s most prominent supporters, said accusations about the frontrunner’s associations with extremists such as Abou Jahjah and Palestinian militant group Hamas had surfaced because opponents are terrified he will take the top job.

UK Labour leadership contender Andy Burnham has warned that Labour’s future “hangs in the balance” as he insisted he was the only candidate able to unite the party.

However, some reports suggest that mainstream Labour MPs are planning a coup against him if he does manage to win the Labour leadership race.

Many voters who have recently joined Labour as registered supporters or as affiliate members are being told their votes will not count as the party works to root out potential infiltrators into the leadership race.

“What’s more, in all actuality, it just helps the Tories by keeping Labor married to obsolete arrangements whilst the individuals we look to serve proceed onward and move away”.

Speaking to BBC Radio 4’s the World at One, Ms Cooper said Mr Corbyn had “not shown any ability” to be part of a team, pointing to his decision to vote against the party whip on hundreds of occasions.

Former Home Secretary David Blunkett intervened with a warning that Labour would remain in opposition if it elected Mr Corbyn as leader.

Clause IV, which backed “common ownership of the means of production, distribution and exchange”, was removed from the constitution at a special Labour conference in Easter 1995 when the party was led by Mr Blair.

And in a further sign of concern that Mr Corbyn – who initially struggled to find a place on the ballot – could emerge victorious, Ms Cooper weighed in to attack her rival’s polices.

A Labour Party spokesperson told the Telegraph: “The Labour Party has a robust system to prevent fraudulent or malicious applications”.

A total of 8,391 people voted Labour in Aylesbury in May.

Meanwhile, challengers Yvette Cooper and Liz Kendall have denied reports that Lord Mandelson approached them in a bid to suspend the election by persuading the pair and Burnham to drop out en masse.

Mr Corbyn, whose domination of the contest to succeed Ed Miliband has left mainstream competitors scrabbling for position, is unveiling his plans to renationalise the railways today.

“But if all we could offer was cuts, but done in a slightly different way than the Tories had done for the last five years, then people simply didn’t want to know”.

“I believe we have caught a public mood”.

The 63-year-old is now the national chairman of the left-wing Trade Unionist and Socialist Coalition (TUSC) political party, which stood 135 parliamentary candidates and 619 local council candidates in the general and local elections this year.