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More than half the general public think the "mainstream media" is deliberately biased against Jeremy Corbyn , polling data has found.

YouGov said the view was held by 51% of British adults - along with 97% of those who plan to back Mr Corbyn in Labour's leadership election.

The survey data showed even 44% of Owen Smith 's supporters believe the press is skewing coverage of Mr Corbyn in a negative light.

When it came to the views of Mr Corbyn's supporters, the media was far from the only group singled out.

The poll showed 55% believe "intelligence services like MI5" have, or probably have, been working to undermine Mr Corbyn.

That compares to 37% of all Labour leadership voters and 19% of the general public.

(Image: PA)

More than a third of Mr Corbyn's backers (35%) believe some Labour MPs were or probably were planted by Tory strategists before the 2015 election to undermine the party's left wing.

That compares to 22% of all leadership voters and 19% of the general public.

And 90% of Mr Corbyn's following think "PR agencies" helped or probably helped orchestrate a wave of 64 resignations against his leadership.

That compares to 64% of all leadership voters and 45% of the general public.

(Image: Roland Leon/Daily Mirror)

Respected pollster YouGov said they surveyed 1,248 people eligible to vote in Labour's leadership election between August 25 and 29.

They then asked the same questions to 1,768 British adults on August 29 and 30, and compared the results.

There was one dramatic theory which held little truck with Corbyn supporters - that corrupt election officials are rubbing out people's votes signed in pencil.

Just 10% of those planning to vote for Mr Corbyn believe the theory, compared to 4% of Owen Smith voters and 18% of the general public.

In July Mr Corbyn blamed "ludicrously biased" media outlets for a "systematic undermining" of his regime.

"I think there's been a systematic undermining by a lot of the House media, around the House of Commons - the Lobby," he said.

(Image: Getty)

He highlighted an LSE study which said 57% of all news stories about Mr Corbyn were "antagonistic" or "critical in a measured but even-handed manner... something we would expect from the media".

The rest were either neutral or postive.

The study also said 44% of stories about Mr Corbyn quoted him in his own words and 23% quoted pro-Corbyn Labour sources.

The study did not compare the treatment of Mr Corbyn to that of any other politician.

See the full results here.