Labour slumped from 40 per cent to 34 per cent in the past fortnight, a survey survey by Opinium for the Observer shows. Mrs May’s Conservative Party stormed ahead of the main opposition party, surging from 37 per cent to 41 per cent to lead the polls. Public approval of Mr Corbyn’s personal handling of Brexit also crashed to a new low of just 16 per cent, down from 18 per cent two weeks earlier.
His disapproval rating is 61 per cent, with and only around four in 10 Labour voters (42 per cent) backing the party’s leader, according to the poll.
Public opinion of Mrs May’s handling of Brexit is only 25 per cent, she just over half of Tory voters (54 per cent) backing her.
But support for Mrs May’s Brexit plan has improved, with 15 per cent believing it is good, up from 12 per cent two weeks ago.
Some 45 per cent believe it is bad, down from 50 per cent a fortnight ago.
The percentage of Brits who believe the UK will leave with a deal in March has risen from 14 per cent to 21 per cent.
And quarter of Leave supporters now believe there will be a no-deal Brexit, up from 15 per cent.
The poll of 2,008 people was carried out between Wednesday and Friday, after a series of Commons Brexit votes on Tuesday.
One amendment tabled by Labour former minister Yvette Cooper, which sought to delay Brexit, failed after 25 Labour MPs defied the party whip to either abstain or vote with the Government against it.
Adam Drummond, head of political polling at Opinium, said: “Theresa May has had a week of good headlines.
“The veneer of party unity and the sense of finally being on the front foot as she heads to Brussels have paid off in the form of the largest Conservative lead since before the general election.
“However, while the passage of the Brady amendment may have reunited the various Tory factions, ultimately the trade-offs that Brexit requires will force those divisions open again when the Conservatives are finally forced to confront them.
“The opening up of such a large lead is more due to Labour’s vote falling back than the Conservative vote increasing.
“Jeremy Corbyn’s balancing act between the Remainers, who make up the bulk of the Labour vote, and the Leave voters in large towns that he needs to get to Number 10 is looking increasingly precarious.
“Labour have lost Leave voters to the Conservatives and Remain voters to the Lib Dems.
“And Mr Corbyn’s personal ratings are back to the lows they were at before the general election.”