A look at the Medway custody suite in Gillingham, Kent - one of the busiest in the country and its staff, who process 40 suspected criminals every day.
With exclusive access to Nottinghamshire's Armed Response Unit, this hard-hitting episode reveals what it's like for gun cops on the front line in an increasingly hostile war against crime.
Following Greater Manchester Police's Tactical Aid Unit as they go into the heart of a riot between English Defence League supporters and Unite Against Fascism.