Labour’s Sadiq Khan has a “commanding” 13-point lead over his Conservative rival Susan Hall, with three weeks until the London mayoral election.

The survey by Redfield and Wilton Strategies puts the current mayor on 43 per cent, with Hall on 30 per cent.

Last time the pollster surveyed Londoners, in September last year, it reported that Khan had a lead of just one point over Hall, suggesting that his relative popularity has risen since the immediate aftermath of the expansion of the ultra-low emissions zone, which took place last August.

The new poll puts the Green Party’s Zoe Garbett in third place on 10 per cent, with the Liberal Democrats’ Rob Blackie on eight per cent and Reform UK’s Howard Cox on seven per cent.

Redfield and Wilton polled 1,000 Londoners between Saturday and Monday.

Although Khan’s winning margin of 13 points over Hall is narrower than other polls since the new year – which have given him leads of between 18 and 25 points – a direct comparison should be treated with caution as different polling companies use different methodologies.

Redfield and Wilton said its poll shows Khan holds “a commanding lead” and “appears well on course for re-election to an historic third term”.

When those who say they do not know how they would vote in a mayoral election are included, Khan leads Hall by 11 per cent.

The poll suggests that the mayor is on course to retain the support of 73 per cent of those who gave him their first preference vote in the 2021 election, when the election was run under a supplementary vote system.

Some eight per cent of his 2021 supporters would now vote for Hall and a further eight per cent for either Garbett (four per cent) or Blackie (four per cent).

Susan Hall in Leicester Square
Susan Hall has lost the support of a third of Shaun Bailey’s voters, the poll indicates. Image: Noah Vickers/LDRS

Hall, meanwhile, retains the support of 67 per cent of those who voted for the previous Conservative candidate – Shaun Bailey – as their first preference in 2021. Some nine per cent of Bailey’s voters at that election now say they would vote for Khan, and a further 16 per cent for either Blackie (seven per cent), Cox (six per cent), or Garbett (three per cent).

The election will be on May 2, with results announced two days later. More details at londonelects.org.uk.

Noah Vickers is the local democracy reporter for City Hall, based at the Evening Standard. Additional reporting by Darryl Chamberlain.