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Elections for the London Mayor and London Assembly were held on 6 May 2021.

  • Labour candidate Sadiq Khan was elected as Mayor of London. Khan won 1,013,721 first preference votes (40.0%), compared to 893,051 for Conservative Party candidate Shaun Bailey (35.3%). The total number of votes cast for Khan rose to 1,206,034 after second preference votes were redistributed, ahead of Bailey, with 977,601 votes.
  • The Green Party’s candidate for Mayor, Siân Berry, came third with 197,976 first preference votes. Luisa Porritt of the Liberal Democrats finished fourth with 111,716 first preference votes.
  • Out of the 2,531,357 people who cast a valid vote in the first round of the mayoral election, 314,893, or 12.4% did not vote for the top four parties as their first preference.
  • Labour won 11 of the 25 seats in the London Assembly elections, one fewer than in 2016, and remain the largest party in the Assembly. They won 41.7% of the Assembly constituency votes, down from 43.5% in 2016.
  • The Conservatives have 9 seats, one more than in 2016. The Green Party and Liberal Democrats both gained one seat, and now the Green Party hold three seats and the Liberal Democrats hold two.

  • Turnout was 40.9% in the mayoral election, down from 45.2% in 2016. Turnout was 41.8% in the Assembly London-wide election, up from 45.6% in 2016.
  • Elections were also held on the same day for the Welsh Assembly, Scottish Parliament, local councils and mayors in some English local authorities, and Police and Crime Commissioners in England and Wales.

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