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
Queen Square, London Preceptors (also known as the College of Teachers) occupied #42 Queen Square from 1855 until 1887. Many of the buildings surrounding the square are devoted to providing, researching and administering health care. Two hospitals, the National Hospital for Neurology and Neurosurgery (NHNN), often referred to synechdochally as "Queen Square", and the Royal London Hospital for Integrated Medicine (formerly the Royal London Homoeopathic Hospital), make up the east side of the square. The Institute of Neurology, part of University College London (UCL), is located in the north east corner of the square. The former Institute for Public Health takes up much