The BBC is not allowed to report details of campaigning while the polls are open.
Read moreBy Ric Bailey
BBC chief adviser, politics
Labour's Sadiq Khan has won a second term as London's mayor with 55.2% of the vote, beating Conservative rival Shaun Bailey. Read the full story here.
Counting complete
Counting complete. After 25 of 25 seats declared.
By Ric Bailey
BBC chief adviser, politics
By Justin Parkinson
Political reporter, BBC News
Niko Omilana and Max Fosh are two prominent YouTubers who stood to be mayor of London in the 2021 election.
The full results for all candidates for London Mayor were:
The minor party and independent candidates were as follows:
The Conservative candidate Shaun Bailey now makes his speech.
He says he was "written off" by pollsters, journalist and other politicians
"But Londoners didn't write me off," he says.
"As a poor boy, you learn that Londoners are generous of spirit and will give you a hearing."
Mr Bailey congratulates Mr Khan but adds that he hopes the re-elected mayor won't "blame everything on the government".
London Mayor Sadiq Khan promises to "strain every sinew to help build a better and brighter future for London after the dark days of the pandemic".
"I am proud to have won an overwhelming mandate today," he says.
Addressing those Londoners who didn't vote for him he says: "I will never ignore your voice, your concerns or your worries."
He says the city and the country are divided - "the scars of Brexit remain, a crude culture war is pushing us further apart," he adds.
"We must use this moment of national recovery to heal those divisions.
"Coronavirus doesn't care if you are a Brexiteer, a Remainer or woke."
He says it is better to build bridges rather than walls and promises to "build bridges between City Hall and the government".
After two rounds of results, the results are as follows:
Labour's Sadiq Khan has won a second term as London Mayor, beating his Conservative rival Shaun Bailey.
Sam Francis
BBC News, London
Labour's Sadiq Khan will face Tory rival Shaun Bailey in a run-off to be mayor of London, after neither won a majority in the first round of voting.
Mr Khan, the current mayor, has 40% of first-preference votes while Mr Bailey has 36% with all constituencies declared.
The mayor is elected on a Supplementary Vote system, where each voter can select a first and second preference.
Second-preference votes for both candidates will now be counted.
A record-breaking 20 candidates ran to become the next mayor of London.
If any candidate had received more than 50% of the first preferences they would have won the election outright.
As no winner was found based on first-preference votes, the top two candidates enter a run-off, where their second preferences are added to their total vote.
The final result is expected to be announced later on Saturday night.
Sam Francis
BBC News, London
Labour is on course to retain its majority on the London assembly, after winning nine of the 14 constituency seats available.
Sadiq Khan is also predicted to be elected mayor of London, putting Labour in charge of both parts of the Greater London Authority.
Membership of the London Assembly is split in two - with 14 representing constituencies representing two boroughs, and the other 11 elected by a party-list system.
The Conservative party won the remaining five constituencies. No constituencies changed hands.
The party-list members will now be decided. These London-wide seats are worked out in a way that benefits parties that did not win constituency seats.
The BBC's polling expert Prof Sir John Curtice projects that Labour will remain the largest party on the London Assembly, with 11 seats once - gaining two from the list system.
This will give Labour one less assembly member than the last term.
In 2016 both Labour and the Conservatives received three more assembly members via the list system. The Green Party won two assembly seats, as did UKIP.
The Liberal Democrats claimed the last remaining seat.
The results of the list-member elections and the mayoral election are expected later tonight.
We're still waiting for the London mayor result which BBC London's Political Editor Tim Donovan says will not arrive before 10pm now.
The candidates are currently waiting around at London's City Hall.
Jamie Moreland
BBC London
There has been a lively mood outside London's City Hall as the mayoral candidates gathered ahead of the results announcement.
UKIP's Peter Gammons shared a joke with Rejoin EU's Richard Hewison, and YouTubers Niko Omilana and Max Fosh met, surrounded by their camera crews.
Candidates from the smaller parties soon arrived too, with Steve Keller, Brian Rose, Laurence Fox, Mandu Reid and Piers Corbyn entering through the tight security.
Despite some chants and songs by anti-vaccination protesters, there's a feeling of nervous excitement in the air, even though most candidates are aware of the BBC's projection that Sadiq Khan is likely to win.