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Labour looks set to lose at least four seats in London where the Ukip collapse is boosting the Conservatives, an exclusive Evening Standard analysis of the General Election fight in the capital reveals today.

A new YouGov poll of Londoners reveals Jeremy Corbyn’s party has gone into reverse in his home city since the 2015 election, slipping from a nine-point lead over the Conservatives to a gap of five points.

Our analysis of key seats, based on polling plus intelligence on the ground, suggests five London seats will change hands on June 8 - while another four are on a knife-edge.

Labour defenders Rupa Huq (Ealing Central & Acton), Wes Streeting (Ilford North), Ruth Cadbury (Brentford & Isleworth) and Joan Ryan (Enfield North) are fighting for their lives against a swing that appears to spell defeat. Ukip’s decline is potentially significant in all four seats.

Tory Tania Mathias is endangered by a swing from the Tories to the Liberal Democrats that could see Sir Vince Cable retake Twickenham.

Two senior Labour figures who won their seats in the 1997 Blair landslide now look vulnerable for the first time. Gareth Thomas in Harrow West and Karen Buck in Westminster North are both in range of Conservative guns if Labour has a bad night.

Labour’s Tulip Siddiq faces a fight to defend Hampstead & Kilburn from the Tory advance. She is protecting a slender 1,138 majority in Glenda Jackson’s old seat

The current state of the parties in London, according to YouGov’s study of 1,040 Londoners, is Labour on 41 per cent, down from their 43 per cent at the 2015 election, and Theresa May’s Conservatives on 36 per cent, up from 34.

Tim Farron’s Liberal Democrats have almost doubled their support in the capital, from just under eight per cent in their crushing defeat of 2010 to a healthier 14 per cent today.

But Ukip has slid from third place in 2015 at eight per cent to fourth place, at six per cent.

The Greens are also down by two points to three per cent.

If half of the 2015 Ukip voters switch to the Conservatives, Labour could suffer a historic defeat in Eltham, where Clive Efford, the MP since 1997, is defending a 2,693 majority.

Ukip had over 6,000 votes there last time.

Even Dagenham & Rainham, the seat of Jon Cruddas, could come in reach of the Tories if there is a mass switch.

Steven Fisher, professor of political sociology at Oxford University, said Ukip’s fall was emerging as “the dominant pattern” of the election.

“Dagenham would really be quite a stretch for the Conservatives,” he said. “But if there is a real Ukip collapse, then it could be a tide that sweeps all before it, including some MPs with strong incumbency support, just as several Lib Dems found at the last election.”

Several other battlegrounds are not yet possible to call. In Richmond Park, where Lib Dem by-election winner Sarah Olney is being challenged to a rematch by ousted Zac Goldsmith, there are mixed signals on the ground but she remains ahead on paper.

In Kingston & Surbiton, where Tory James Berry is defending against Lib Dem former MP Sir Ed Davey, some 4,000 Ukip voters could be important.

Another rematch, between Labour defender Neil Coyle and former Lib Dem MP Sir Simon Hughes in Bermondsey & Old Southwark, could also go either way, but Labour appears slightly ahead on paper.