Characters
Ronnie Brooks (Bradley Walsh), is a Detective Sergeant assigned to London's Major Incident Unit. A recovering alcoholic and absent-father, Ronnie values his job more than anything. He lives to see justice served. Ronnie is the light-hearted leader and mentor of his junior partner, and has turned down numerous promotions in order to make a difference on the streets.
Matt Devlin (Jamie Bamber, series 1–5), is a Detective Sergeant and the junior partner to Ronnie's senior role. Flirtatious, tech-savvy and people-smart, Matt formed strong bonds with both Alesha and Natalie. It was no surprise then, that when he was gunned down outside a court-house, the team were inconsolable.
Natalie Chandler (Harriet Walter, series 1–6; guest star series 8), is the mother-figure to Ronnie's father-figure and the Senior Investigating Officer at the M.I.U. She departed to care for her mother, who was in the late stages of a terminal disease.
James Steel QC (Ben Daniels, series 1–4), is a senior crown prosecutor employed by the London CPS.
Alesha Phillips (Freema Agyeman, series 1–6), is Steel's partner and a junior CPS prosecutor. A tough lawyer raised on the streets of London, Phillips had a flirty relationship with Devlin until his death. She departed the CPS to become a senior prosecutor in Greater Manchester.
George Castle (Bill Paterson, series 1–4), was the first director of CPS London and the supervisor of Phillips and Steel.
Jake Thorne (Dominic Rowan, series 5–8), was Phillips second partner, and a senior crown prosecutor.
Henry Sharpe (Peter Davison, series 5–8), succeeded Castle as the director of CPS London and was the direct supervisor to Thorne and Phillips.
Sam Casey (Paul Nicholls, series 6–7), is a Detective Sergeant who has worked at M.I.U. for several years. Originally assigned to investigate the death of Devlin, he was partnered with Ronnie on a full-time basis sometime during the subsequent year. He is a part-time dad, and presumably left the force to focus more wholly on the upbringing of his child.
Kate Barker (Georgia Taylor, series 7–8), replaced Phillips following her promotion. Loud and nosey, Barker was a defence barrister before joining Thorne, making it exceedingly difficult to build a professional relationship upon their adversarial experiences.
Wes Layton (Paterson Joseph, series 7–8), worked with Ronnie during his days on the beat. Assigned to the MIU temporarily to cover Chandler's leave, but became her permanent replacement shortly thereafter. He was assassinated during series 8 as part of a series of gun-crimes that also targeted Sharpe.
Joe Hawkins (Ben Bailey Smith, series 8), was Ronnie's third and final partner. A newly promoted DS, he is far more working class than his predecessors and as such possesses greater street smarts. Eager to learn, he's a fresh mind for Ronnie to mould, and he's fiercely loyal.
Elisabeth Flynn (Sharon Small, series 8) joined the team after she was promoted following an on-the-job injury. Her personal crusade was against knife-crime, making it ironic that that was the first case that fell onto her desk. She sees Ronnie as a dinosaur, and has a deep desire to modernise the police force. She appears only in the final episode of the series.
