Law enforcement in the United Kingdom in the context of "Sergeant"

The Government of the United Kingdom maintains several intelligence agencies that deal with secret intelligence. These agencies are responsible for collecting, analysing and exploiting foreign and domestic intelligence, providing military intelligence, performing espionage and counter-espionage. Their intelligence assessments contribute to the conduct of the foreign relations of the United Kingdom, maintaining the national security of the United Kingdom, military planning, public safety, and law enforcement in the United Kingdom. The four main agencies are the Secret Intelligence Service (SIS or MI6), the Security Service (MI5), the Government Communications Headquarters (GCHQ) and Defence Intelligence (DI). The agencies are organised under three government departments, the Foreign Office, the Home Office and the Ministry of Defence.

Although the history of the organisations dates back to the 19th century or earlier, the British intelligence system as we know it today – with components for domestic, foreign, military, and communications intelligence – did not emerge until the years immediately preceding World War I. The decryption of the Zimmermann Telegram in 1917 was described as the most significant intelligence triumph for Britain during World War I, and one of the earliest occasions on which a piece of signals intelligence influenced world events. During the Second World War and afterwards, many observers regarded Ultra signals intelligence as immensely valuable to the Allies of World War II. In 1962, during the Cuban Missile Crisis, GCHQ interceptions of Soviet ship positions were sent directly to the White House. Intelligence cooperation in the post-war period between the United Kingdom and the United States became the cornerstone of Western intelligence gathering and the "Special Relationship" between the United Kingdom and the United States.

The Crown Prosecution Service (CPS) is the principal public agency for conducting criminal prosecutions in England and Wales. It is headed by the Director of Public Prosecutions.

The main responsibilities of the CPS are to provide legal advice to the police and other investigative agencies during the course of criminal investigations, to decide whether a suspect should face criminal charges following an investigation, and to conduct prosecutions both in the magistrates' courts and the Crown Court.

The history of law enforcement in the United Kingdom charts the development of law enforcement in the United Kingdom and its predecessor states. It spans the period from the Middle Ages, through to the development of the first modern police force in the world in the nineteenth century, and the subsequent modernisation of policing in the twentieth and twenty-first centuries.

There are a number of agencies that participate in law enforcement in the United Kingdom which can be grouped into three general types:

• Territorial police forces, who carry out the majority of policing. These are police forces that cover a police area (a particular region) and have an independent police authority. Current police forces have their grounding in the Police Act 1996 (in England and Wales), a combination of Police (Scotland) Act 1967 and Police and Fire Reform (Scotland) Act 2012 (in Scotland) and the Police (Northern Ireland) Act 2000 (in Northern Ireland), which prescribe a number of issues such as appointment of a chief constable, jurisdiction and responsibilities.
• National law enforcement bodies, including the National Crime Agency and national police forces that have a specific, non-regional jurisdiction, such as the British Transport Police. The Serious Organised Crime and Police Act 2005 refers to these as 'special police forces', not including the NCA which is not a police force. In addition, there are non-police law enforcement agencies, whose officers are not police officers, but still enforce laws, and other bodies with solely investigatory powers.
• Miscellaneous police bodies, mostly having their foundations in older legislation or common law. These are responsible for policing specific local areas or activities, such as ports and parks. Before the passing of recent legislation such as the Serious Organised Crime and Police Act 2005, they were often referred to as 'special police forces'; care must therefore be taken in interpreting historical use of that phrase. These constabularies are not within the scope of the legislation applicable to the previously mentioned organisations but can still be the subject of statutes applicable to, for example, docks, harbours or railways. Until the passing of the Railways and Transport Safety Act 2003, the British Transport Police was such a force.

Most law enforcement in the United Kingdom is carried out by territorial police forces that police the general public and their activities. The other types of agencies are concerned with policing of more specific matters.

Superintendent (Supt) is a rank in the British police and in most English-speaking Commonwealth nations. In many Commonwealth countries, the full version is superintendent of police (SP). The rank is also used in most British Overseas Territories, in many former British colonies, as well as in Portugal and in several former Portuguese colonies. In some countries, such as Italy, the rank of superintendent is a lower rank.

The Police Service of Northern Ireland (PSNI; Irish: Seirbhís Póilíneachta Thuaisceart Éireann; Ulster Scots: Polis Service o Norlin Airlan), is the police service responsible for law enforcement and the prevention of crime within Northern Ireland.

It is the successor to the Royal Ulster Constabulary (RUC) after it was reformed and renamed in 2001 on the recommendation of the Patten Report.