Only last month it emerged that even committed Labour voters thought that Mrs May made a better prime minister than Jeremy Corbyn would do, if he ever got the chance.
It is the largest lead for the Conservatives and their highest rating in a YouGov poll since 2008, while UKIP's standing is the lowest in more than four years.
Angus MacNeil, MP for Na h-Eileanan an Iar, suggested the SNP have a more viable alternative to the Conservatives than the Labour Party.
Upon Jeremy Corbyn's election as Labour leader in 2015, his son stepped up to become the Shadow Chancellor's chief of staff.
In addition, reports The Independent, the father of three has vowed to "overturn the rigged system" of which he feels the government has full control.
Speaking in London, he framed the election as "the Conservatives, the party of privilege and the richest, versus the Labour Party".
"(May) will try to downplay the issues that affect people's lives every day and instead turn the election into an ego trip about her own failing leadership and the machinations of the coming negotiations in Brussels", he said.
A spokeswoman for Mr Corbyn insisted Labour's position, backing a "meaningful vote" in Parliament, had not changed.
Addressing supporters in the capital later, Mr Corbyn will say: "Much of the media and establishment are saying this election is a foregone conclusion".
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The Conservatives are set to include in their election manifesto May's promises to take Britain out of the single market and cut European Union migration after Brexit, according to the Daily Mail.
They think there are rules in politics which if you don't follow by doffing your cap to the powerful people, accepting that things can't really change, then you can't win.
He spoke in defence of ordinary people who he said spent their lives working hard and in the end were left with nearly nothing.
He added: "We are putting a message out there - this country does not have to be so divided, (there) does not have to be such appalling levels of poverty and unachieved ambition because of people growing up in poverty".
If I were Southern Rail or Philip Green [chairman of Arcadia Group], I'd be anxious about a Labour government'.
A Lib Dem source added: "Remain Conservative MPs can not sign up to a hard Brexit manifesto, it goes against everything they say they believe".
Mr McDonnell said exact proposals would be cemented in the coming weeks, but Labour would ensure both "corporations and the rich" would pay more as part of a fairer tax system to cover the cost of increased investment in the NHS, schools and other services.
He insisted that Labour could win the election, despite their difficulties in the polls.
However, the Lib Dems have a steep hill to climb having come fourth in 2015 as Labour's Diana Johnson was returned with a majority of nearly 13,000.
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