Chief of police
Chief police officer is a phrase used in the United Kingdom to describe the position of the most senior police officer in a police force. It refers to the 53 Chief Constables, the Commissioner of the City of London Police or the Commissioner of the Metropolitan Police. They are members of the Association of Chief Police Officers. The phrase is used in legislation on the power to permit public processions, or grant firearms licenses. Many routine activities are delegated to constables.