City of London
London now refers to a much larger conurbation roughly corresponding to the London region, also known as the Greater London administrative area, comprising 32 boroughs (including the City of Westminster), in addition to the City of London. The local authority for the City, the City of London Corporation, is unique in the UK and has some unusual responsibilities for a local council, such as being the police authority. It also has responsibilities and ownerships beyond the City's boundaries. The Corporation is headed by the Lord Mayor of the City of London, an office separate from (and much older than) the Mayor of London.
The City is a major business and financial centre, ranking as the world's leading centre of global finance. Throughout the 19th century, the City was the world's primary business centre, and continues to be a major meeting point for businesses. London came top in the Worldwide Centres of Commerce Index, published in 2008. The insurance industry is focused around the eastern side of the City.