A man walks past a polling station at the Royal Hospital Chelsea in London, Britain, on May 6, 2021. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by Tim Ireland/Xinhua)

A man leaves a polling station for the local elections at the Royal Hospital Chelsea in London, Britain, on May 6, 2021. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by Tim Ireland/Xinhua)

Britain's Labour Party leader Keir Starmer and his wife Victoria Starmer leave a polling station after voting in local elections in London, Britain, on May 6, 2021. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by David Cliff/Xinhua)

Photo taken on May 6, 2021 shows a general view of a sign of a polling station for the local elections, in London, Britain. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by Tim Ireland/Xinhua)

A man wearing a face mask walks to a Charing Cross Road polling station in London, Britain, on May 6, 2021. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by David Cliff/Xinhua)

Britain's Labour Party leader Keir Starmer and his wife Victoria Starmer walk to a polling station to vote in local elections in London, Britain, on May 6, 2021. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by David Cliff/Xinhua)

Britain's Labour Party leader Keir Starmer and his wife Victoria Starmer walk to a polling station to vote in local elections in London, Britain, on May 6, 2021. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by David Cliff/Xinhua)

People leave a polling station at Chelsea Town Hall in London, Britain, on May 6, 2021. Millions of voters in Britain are going to polling stations for local elections in what political commentators have dubbed as the Super Thursday, which is seen as a major test for Britain's main political party leaders. More than 5,000 seats are up for grabs in city hall and town hall elections, with the mayor of London and 12 provincial mayors along with police and crime commissioners also being elected. (Photo by Tim Ireland/Xinhua)