British TV Acronyms, Decoded

CID

Criminal Investigation Department — the traditional name for the detective branch that investigates crime.

SIO

Senior Investigating Officer — the officer formally responsible for leading a major investigation. In murder investigations, this is often a DCI.

Guv

Short for "Governor" — how junior officers address their senior investigating officer.

PCSOs

Police Community Support Officer — a uniformed neighbourhood-policing role with some police powers, but not the full powers of a constable.

WPC

Woman Police Constable — an older, gender-specific title. No longer official, but common in period-set dramas.

CPS

Crown Prosecution Service — prosecutes criminal cases in England and Wales and makes charging decisions in more serious or complex cases.

MIT

Major Investigation Team — a specialist team used by some forces for homicide and other major investigations.

PACE

The Police and Criminal Evidence Act 1984 — the law governing arrest, search, and interview. Why cautions sound so formal.

OCG

Organised Crime Group — a criminal network operating on an ongoing basis, not a one-off crew.

SOCO

Scene of Crime Officer — the UK's version of a CSI, gathering forensic evidence at the scene.

Custody

Formally detained at the station after arrest, before being charged or released.

Nick

Slang for a police station ("down the nick") — or, as a verb, to steal.

Nicked

"You're nicked" means you're under arrest. Context decides whether it means arrested or stolen.

Blue Lights

An active emergency response — and the name of the BBC series following rookie officers in Belfast.

Not a real unit — AC-12 (Anti-Corruption Unit 12) is fictional, invented for Line of Duty. Real anti-corruption departments exist in every force, just not under that name.