London had the world's first professional police force, and the police forces of the British Isles continue to rank as among the best in the world. In a similar format to previous pocket guides to the British armed forces, this handy guide covers chain-of-command, rank, organization, abbreviations and active operations. A wealth of detail will be found here on the conventional Metropolitan forces of England, Wales and Scotland, as well as the more paramilitary activities of the Royal Ulster Constabulary.