Britain's Toughest Cops

Cameras follow members of the police's Operational Support Units - officers specially trained to deal with difficult and dangerous situations. In the first edition, the Lincolnshire firearms unit faces a man on the rampage with a meat cleaver, while a Sussex team digs for the murder victims of serial killer Peter Tobin.

West Yorkshire's helicopter unit joins the hunt for an armed man, Kent's search team trawls through a bloody crime scene for potential evidence, and drug dealers receive an early wake up call.

Lincolnshire's Operational Support Unit raids a suspected heroin dealer's home, Cumbrian police try to control warring soccer fans, and officers chase car thieves in West Yorkshire.

A search team in Lincolnshire hunts for a missing doctor, and suspected armed robbers are taken in for questioning in West Yorkshire.

A rave organiser becomes the target of the Operational Support Unit, and gangs of rival football supporters threaten to breach the peace.

The North Yorkshire team find more than they bargained for while searching for a stolen tractor, and the specialist search team in Sussex discover a car that may have a body in it.

A dive team in Sussex tries to find a missing man's body, and West Yorkshire's automated number plate recognition system catches a taxi driver dealing drugs from his car.

A firearms team hunts down a dangerous man who attacked two elderly women in Leeds, and officers discover a cannabis farm worth £150,000.

Lincolnshire's dog team finds a huge haul of drugs in a domestic garden, and in North Yorkshire a search for stolen bikes uncovers an arsenal of weapons instead.

West Yorkshire police must keep the peace when a demonstration by the far right English Defence League becomes violent.