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Jeremy Corbyn has become so unpopular in London that even Labour supporters in his home city think he is doing badly, a damning new poll revealed today.

The Labour leader gets negative ratings from every key group of Londoners, including young people, unskilled workers and inner London residents — seen as the party’s bedrock voters. But another Labour politician has soared up the ratings to become the most popular politician among Londoners: Mayor of London Sadiq Khan outshines not only Mr Corbyn but also Theresa May and Boris Johnson.

Astonishingly, half of Conservatives think Mr Khan is doing well, along with majorities of young and old, different social classes and inner and outer Londoners.

The findings, produced for Queen Mary University of London, are a triumph for the Mayor — and a serious blow to his party’s leader.

Just 18 per cent of Londoners think Mr Corbyn is doing well, while 62 per cent say he is doing badly — a negative score of -44. His ratings are a disastrous -35 among people who backed Labour at the 2015 general election, and -7 even among people who say they are current Labour supporters.

Some 58 per cent of Londoners say Mr Khan is doing well and a mere 23 per cent think he is doing badly — a score of +35. Among the better-off ABC1 voters, a Tory target, he scores +41. In outer London, which was Mr Johnson’s heartland, Mr Khan scores +31.

“Part of the reason Khan polls so well is he has cross-party appeal, from not only Labour voters but a big majority of Lib-Dems and even just over half of those who voted Conservative in 2015,” said Professor Philip Cowley, director of the university’s Mile End Institute.

Mr Johnson scored a massive +43 among Londoners in a 2013 poll in the prime of his stint as Mayor. However, he is now down to -14 in his new role as Foreign Secretary.

The Prime Minister’s rating was a healthy +9 among Londoners. The net scores of other leaders were Lib Dem Tim Farron, -8; Ukip’s Paul Nuttall, -34; and the Greens’ Caroline Lucas, +13.

The findings will bolster Mr Khan’s status as a possible Labour leader-in-waiting — but leave Labour MPs reeling.

Although Labour is still ahead of the Conservatives in London, its lead has slumped over the past year — from 16 points last April to just three. The state of the parties in London is currently Conservatives 34 per cent (+4), Labour 37 (-9); LD 14 (+7); Ukip nine (-4) and Greens five (+1).

The doubling of the Liberal Democrat vote in a year will be seen as vindication for Mr Farron’s policy of opposing Brexit.

“Just under a year ago, Labour led among both sexes, all age groups except the over-65s, both middle class and working class people, and in both inner and outer London,” said Professor Cowley.

“The Conservatives are now level among male Londoners, ahead among the over-fifties, and a point or two ahead among the middle class and outer Londoners.”