According to the series "Behind the Scenes", this was shot documentary style all using available light. This means the actors could be somewhat spontaneous and the cameras had to follow the action. Most scenes required one two takes at most.
The building used as the exterior of the Team's office is 18 Mansell St E18AA.
In series 3 the exterior of the team's office is the defunct Camberwell Green Magistrates Court, 15 D'eynsford Road, London SE5 7UP.