Greater London is under the strategic local governance of the Greater London Authority (GLA).[24] It comprises an elected assembly, the London Assembly, and an executive head, the Mayor of London.[25]
The current Mayor (not to be confused with the Lord Mayor of London) is Boris Johnson. He is scrutinised by the elected London Assembly, which may amend his annual budget (by two-thirds majority) but otherwise lacks the power to block his directives. The headquarters of the GLA is at City Hall in Southwark. The Mayor is responsible for Greater London's strategic planning and is required to produce a London Plan document.