What is the abbreviation for greater london authority? Greater London Authority. The Greater London Authority ( GLA ), also known as City Hall, is the devolved regional governance body of London, with jurisdiction over both counties of Greater London and the City of London. It consists of two political branches: the executive Mayoralty (currently led by Sadiq Khan) and the 25-member London Assembly,...How is the greater london authority funded? The Greater London Authority is mostly funded by direct government grant and it is also a precepting authority, with some money collected with local Council Tax. The GLA is unique in the British devolved and local government system, in terms of structure (it uses a presidential system -esque model),...What is the global business authority gla? The GLA is different from the Corporation of the City of London with its largely ceremonial Lord Mayors, which controls only the Square Mile of the City, London's chief financial centre.How do i contact the mayor of london by phone? Telephone. 020 7983 4000. E-mail. [email protected]. Website. www.london.gov.uk.