In Season 1, Stafford faces a head-on clash with the Home Office, learns about a planned student demonstration from his daughter and defies an order to evict trespassing protestors.
In Season 2, an animal rights group make hoax calls, a former psychiatric patient abducts a teenage runaway and Stafford orders the killing of a man holding siege at a psychiatric hospital.
In Season 3, Stafford becomes Head of Europol, a corruption enquiry reaches a successful conclusion, an American gas rig is hijacked and a councillor is implicated in illegal practices.
In Season 4, Cade is the subject of public outrage after two terrorist bomb blasts, Anne Stewart fails to win the promotion she was hoping for and Cade tries to boost the force's image.
In Season 5, an armed robbery takes place at a countryside mansion, a child is killed by joyriders, racial hatred causes problems for Cade and a demonstration takes place at a nuclear plant.