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Labour's been in a battle for its future for more than a week as Jeremy Corbyn refuses calls to quit.

But while 64 frontbench MPs resigned under the fierce gaze of the public, an online campaign that's backing them had a bit of mystery to it.

That's because despite enlisting thousands of people urging Mr Corbyn to stand down, including many MPs, the Saving Labour website has no public chief and was registered anonymously.

So the Mirror managed to speak to someone involved with the site, whose domain name was registered on June 25 a day after the EU referendum result and hours before Hilary Benn was sacked.

Labour donor Reg Race, 69, served as a famously left-wing MP nearly four decades ago before running a firm that performs staff surveys for the NHS.

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He said Saving Labour grew as an "organic thing" and warned "there is great concern about the future" after Mr Corbyn lost a no confidence vote 172-40.

(Image: Getty)

Dr Race, first identified after the campaign was linked to a property he owns, declined to comment yet on who else was involved with the site, how it came about or talk further about his thoughts on Mr Corbyn.

However, he said the group was planning to announce more about itself in due course.

Asked if his past left-wing allegiances remained the same, he said: "Everybody's views change over time. I'm not anybody's 'ite' - Blairite, Corbynite, Bennite."

And asked if he was the sole person involved with the site, he said: "Absolutely not - it's a whole bunch of people".

Several Labour MPs fed up with Mr Corbyn have thrown their weight behind the site after it was set up. One told the Mirror: "It's a really great initiative. We are trying to save the Labour party now - it's that serious. It's existential."

Dr Race was the left-wing MP for Wood Green between 1979 and 1983 and became famous for using the word "f***" in a Commons debate about sex shops.

He stood again unsuccessfully in 2001 for Chesterfield, the seat held by Tony Benn for 27 years.

Since then he has donated just under £50,000 to the Labour Party , including £5,000 to Alan Johnson during his 2007 campaign to be deputy leader.

He has also given £1,500 to the constituency party in Bolsover, the seat of veteran left-winger Dennis Skinner for 46 years.

He is a director of Quality Health Limited, the country's biggest provider of NHS staff surveys working for 360 health trusts.

Despite being listed as the managing director on the firm's website, Dr Race said he is now retired and the information is out of date.

Of the Saving Labour campaign he added: "This has got nothing to do with my work life or my company."

Today Owen Smith and Angela Eagleput their leadership challenges on hold to allow further talks on Jeremy Corbyn ’s future.

They said negotiations on “healing the rift” in the party needed more time to succeed.

But both made clear they were ready to stand against Mr Corbyn if there was no breakthrough.

“I stand ready to do anything I can to save and serve the party,” Mr Smith said.

He said talks between the leadership, deputy leader Tom Watson and Unite general secretary Len McCluskey had been “productive” and would continue over the weekend.

More than 100,000 people have joined Labour since the EU referendum , sources said - with Chancellor John McDonnell claiming most of them have joined to back Mr Corbyn.