Mayor of London the winner hours earlier. Mr Sadiq Khan, a member of the Labour party, is the first Muslim to be elected Mayor of London. Incumbent Mayor Boris Johnson did not run for re-election for a third term in office, as he had been elected the Member of Parliament for the Conservative Party in Uxbridge and South Ruislip in the 2015 General Election. Most powers are derived from the Greater London Authority Act 1999, with additional functions coming from the Greater London Authority Act 2007, the Localism Act 2011 and Police Reform and Social Responsibility Act 2011. The main functions are: The
Lord Mayor of London been mandatory for election to the Lord Mayoralty. Two Sheriffs are selected annually by Common Hall, which meets on Midsummer's Day for this purpose. By an ordinance of 1435, the Lord Mayor must be chosen from amongst the Aldermen of the City of London. Those on the electoral roll of each of the City's 25 Wards select one Alderman, who formerly held office for life or until resignation. Now each Alderman must submit for re-election at least once in every six years. The Lord Mayor is then sworn in November, on the day before the Lord Mayor's Show ("see below").