The opening credits consist of outside shots of Slade prison and of several doors and gates being closed and locked, which was intended to set the scene. In the first series, there were also shots of St Pancras railway station, which was changed in subsequent series to shots of Fletcher walking around Slade prison. Title music was thought unsuitable for a show set in prison, so instead there is a booming narration (voiced by Barker himself) given by the presiding judge passing sentence on Fletcher: