Greater London is often referred to as "the City" or "the Square Mile" and it forms the main financial district. Archaically, the urbanised area of London was known as the Metropolis. In common usage, the terms "London" and "Greater London" are usually used interchangeably. Greater London is officially divided for some purposes, with varying definitions, into Inner London and Outer London. For some strategic planning purposes it is divided into five sub-regions. Greater London is under the strategic local governance of the Greater London Authority (GLA). It consists of an elected assembly, the London Assembly, and an executive head, the Mayor of
Royal Commission on the Amalgamation of the City and County of London each of these issues. The new central body, which was to be called the Corporation of London, or more formally the "mayor and commonalty and citizens of London", was to be the legal successor of both the existing city corporation and the London County Council. In effect the status of city was to be extended from the old City to the area of the entire county, which would be redesignated as the City of London. The new city was to be governed by a council. The first matter addressed was the membership and method of election of the central body.