Andy Burnham believes he is winning over enough undecided Labour supporters to pip frontrunner Jeremy Corbyn to the party leadership.

The Burnham camp's canvassing figures, seen by The Herald, suggest nearly a third of the 550,000 Labour members, affiliates and supporters entitled to vote in the election have yet to make their minds up.

And the biggest slice, according to the rolling phone survey, is leaning towards backing the Leigh MP.

A sample of nearly 6000 leadership voters in the first two weeks of this month also suggested support for odds-on favourite Mr Corbyn had dropped significantly compared with the last two weeks in July.

Over the same period, the number of 'don't-knows' rose from 16 per cent to 31 per cent.

The figures emerged as Mr Burnham concluded a two-day campaign visit to Scotland, speaking in Aberdeen, Edinburgh and Glasgow.

His trip included a visit to a Sainsbury's in the North East to meet shop workers whose union USDAW is backing his leadership bid.

The shadow health secretary said: "It's all to play for.

"The coincidence of the Labour leadership election and the silly season in the media has not been a particularly helpful thing.

"People have jumped to conclusions that aren't supported by the information that we've got.

"Around a third of voters are undecided. About half have not received their ballot papers so it's all the play for."

The Burnham camp's figures put their man out in front, a position his team dismisses because of "inherent bias" in the data collected by his supporters.

However, they believe the dip in support for Mr Corbyn is real.

Of the don't-knows, 36 per cent are leaning towards Mr Burnham, 23 per cent to Mr Corbyn, 15 per cent to Liz Kendall and 25 per cent to Yvette Cooper, according to the latest canvassing.

Mr Burnham added: "I'm confident I'm the only person who can beat Jeremy Corbyn so I'm here in Scotland fighting for every vote and fighting for the Labour party as I want it to be going forward."

He said, as leader, he would approve measures to give Scots party leader Kezia Dugdale the "powers and autonomy she needs to get on with being a strong opposition".

Citing the strong opposition in Scotland to Iain Duncan Smith's welfare reforms, he added: "We want more power in the hands of Scottish Labour to criticise those issues and to develop ideas about how that regime can be made more humane without waiting for any permission from the DWP spokesperson in London."

However, he said policy on UK issues would be determined by the UK party.

On Trident, an issue to be debated by Scottish Labour at its conference in October, he said "all voices" would contribute to a wider debate.

But he stressed: "In the end, when you talk about reconciling differences, this has to be a decision for Labour at the UK level. That then would be policy."

He said it "felt appropriate" for the whole party to debate the future of Britain's nuclear deterrent but his "clear recommendation" as leader would be to renew Trident.

He said Scottish Labour had suffered a "catastrophic" loss of trust of voters but vowed to play a hands-on role in trying to win it back, starting with a speech to the party conference in October if he wins the leadership.

Meanwhile, Yvette Cooper appeared to hit out at Mr Burnham comparing attacks from his camp to an "anti-suffragette strategy".

Earlier in the contest Mr Burnham’s campaign team referring to her tactics as being straight out of (her husband) “Ed Balls play-book’

A former aide to Gordon Brown, MP Ian Austin, has also blamed "panic in Falkirk" for the crisis currently hitting the Labour leadership contest.

Labour changed its leadership rules following allegations of attempted vote rigging in the Scottish constituency.

It is these new rules opponents claim could allow Conservatives and hard-left activists to put Mr Corbyn in charge of the party.

There was further controversy yesterday when it emerged that the head of one of the UK’s largest unions was among one of thousands told they cannot vote.

Mark Serwotka, the general secretary of the Public and Commercial Services (PCS) union, who has previously said that he voted Green in 2010 , was told that Labour did not believe he supported the party's values.

It also emerged that Labour is to use canvassing details gathered during the general election to weed out “infiltrators” trying to skew the result.