Sadiq Khan is seeking his third term as London mayor at the next set of local elections.
If he wins, this would make him the most electorally successful person to run the capital since the introduction of the mayoralty in 2000.
Here, Sky News goes through his career thus far and takes a look at what his policies are.
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Party: Labour
Campaigning priorities: Free school meals for primary children, freeze TfL fares
Notable achievements: Twice elected as mayor
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Sadiq Khan was born and raised in south London, and is the child of Pakistani immigrants.
Before entering politics full-time, he worked as a lawyer specialising in human rights, rising to become a partner before leaving to stand as a politician in 2004.
Mr Khan successfully stood as a Labour MP in 2005, entering the House of Commons as the representative for Tooting in south London. He had previously been a councillor.
By 2008 he had been made a junior minister in the Department for Communities and Local Government, and a year later was made a transport minister by Gordon Brown.
Mr Khan kept his seat in 2010, and worked on Ed Miliband’s successful campaign to lead the party.
He also won re-election in 2015, and nominated Jeremy Corbyn to be leader of Labour – although later withdrew his support.
In 2016, Mr Khan resigned as an MP and was elected as mayor of London, beating the Conservative candidate Zac Goldsmith to replace Boris Johnson.
Read more:
London mayoral candidates: Who are the runners and riders
Everything you need to know ahead of local elections
Mayoralty
Mr Khan’s first campaign was run on pledges to increase home building and freeze rail fares.
During this period, he also campaigned heavily for the Remain side of the Brexit debate, including marching in London and advocating a second vote in 2019.
The next election was set to take place in 2020, but was delayed until 2021 due to the COVID pandemic.
During the lockdowns, Mr Khan took a range of actions, including suspending underground services and recommending that people wear masks.
As part of a bailout agreement for Transport for London with the government, Mr Khan agreed to raise ticket prices by more than inflation.
When the campaign began, Mr Khan ran on a platform of helping people and businesses recover from the pandemic, as well as promoting low-traffic neighbourhoods and setting a target of 10,000 new council homes a year.
Come polling day, he beat Conservative candidate Shaun Bailey to secure a second term.
Issues which have come to the fore during Mr Khan’s second term as mayor include air pollution and crime.
The expansion of the capital’s ultra-low emission zone (ULEZ) has proved controversial and a target for those campaigning against Mr Khan – as have low-traffic neighbourhoods.
On crime, Mr Khan effectively sacked Metropolitan Police Commissioner Dame Cressida Dick over her response to racism and misogyny in the force by saying he had lost confidence in her.
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2024 race
Mr Khan has said this election is a chance to “continue the progress we have made”.
He added that the prospect of a Labour government means “this mayoral election can also be the first step towards a decade of national renewal”.
Mr Khan is again pledging to freeze TfL fares, and has also promised to introduce free school meals for all state-educated primary children.
Read our profiles of the other leading mayoral candidates:
Who is Rob Blackie, the Liberal Democrat candidate for London mayor?
Who is Howard Cox? Reform UK’s London mayoral candidate
Who is Susan Hall, the Tory London mayoral candidate?
Who is Zoë Garbett? The NHS worker and Green candidate vying to be London mayor
Also running
Femi Amin – Animal Welfare
Count Binface – Count Binface
Natalie Campbell – Independent
Amy Gallagher – Social Democratic Party
Tarun Ghulati – Independent
Andreas Michli – Independent
Brian Rose – London Real
Nick Scanlon – Britain First