The Greater London Authority (GLA), colloquially known by the metonym City Hall, is the devolved regional governance body of Greater London, England. It consists of two political branches: an executive Mayor (currently Sadiq Khan) and the 25-member London Assembly, which serves as a means of checks and balances on the Mayor. The authority was established in 2000, following a local referendum, and derives most of its powers from the Greater London Authority Act 1999 and the Greater London Authority Act 2007.
It is a strategic regional authority, with powers over transport, policing, economic development, and fire and emergency planning. Three functional bodies âTransport for London, the Mayor's Office for Policing and Crime, and the London Fire Commissionerâ are responsible for delivery of services in these areas. The planning policies of the Mayor of London are detailed in a statutory London Plan which is regularly updated and published.