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Sadiq Khan’s ratings have plunged to their lowest yet after a long summer of violent crime.

The Mayor has fallen behind among key target groups including the over-Fifties, working-class voters, white people and the outer London “doughnut”.

Overall, Mr Khan’s ratings have slipped from +22 in May this year down to +4 today, according to the YouGov study commissioned by Queen Mary University of London.

It revealed that both Labour and the Conservatives have slumped in popularity in London over the summer, with the Tories falling to a dismal vote share of barely one voter in four. And former Ukip leader Nigel Farage, who has hinted at running in the 2020 mayoral contest, is overwhelmingly rejected by Londoners.

Professor Philip Cowley, of Queen Mary’s Mile End Institute, said: “Sadiq Khan has suffered a noticeable hit in his ratings, down from being the most popular politician in Britain just 18 months ago, to being ahead but not by much.

“The 2020 contest is looking a lot more interesting now than it did even before this summer. Justine Greening and other big Tory beasts might now regret their decision not to have a tilt at him.” Key details of the survey include:

Londoners are divided over Mr Khan’s record. Overall, 44 per cent say he is doing well, while 40 per cent say he is doing badly. That is a major change since May when the figures were 52 per cent well, 30 per cent badly.

It is even more pronounced compared with March 2017 when his ratings were 58 per cent positive and 23 per cent negative.

Several key voter groups have turned against Mr Khan. He remains hugely popular among younger voters but now people in the 50-64 age group give him a negative rating of -5.

While Mr Khan was previously ahead among all ethnic groups, now white Londoners rate him at -5, while among black and minority ethnic Londoners he is ahead by +21.

Mr Khan has slipped among the C2DE social class, where he is seen as doing badly by 46 per cent and well by 39, a net -7. He is backed in the wealthier ABC1 social class, with 48 per cent rating him as doing well and 35 badly.

Voters in the big outer London ring now say Mr Khan is doing badly by 44 to 39 per cent, while inner Londoners say he is doing well by 49-35.

The Tories have plunged to a voting share of just 26 per cent in London, seven points behind what they achieved in the 2017 election. Labour is strongly ahead on 48 per cent, but down from their 52 per cent share in April, which suggests the shine is coming off Jeremy Corbyn after a torrid summer of arguments over anti-Semitism. The Liberal Democrats are up five to 15 per cent, their best showing since the election.

Londoners oppose Nigel Farage standing for mayor by 62 per cent to 22 per cent. Almost every voter group opposes his candidacy with the exception of Leave backers, who were a lukewarm 45 per cent for and 35 against. Remainers were 84 per cent against.

Last week a special investigation by the Standard shone a light on the mayor’s record. It highlighted the areas voters rated as their biggest priorities in 2016 when he ran for office — housing, crime, transport and pollution. The Khan Audit revealed mixed results in all four and suggested the biggest issue in 2020 will be his record of delivery.