'Line Of Duty' Series 4 Cast: Meet The Stars Of BBC's 'Arguably Finest Crime Drama'

’Line of Duty’ Series 4 has followed its predecessors in recruiting top-notch guest stars to become the subject of AC-12’s latest investigation, in this case into a police arrest and charge that starts to look less convincing the more it’s examined.

As well as the regular cast members - Martin Compston, Vicky McClure and Adrian Dunbar - there are some very familiar faces lining up on screen. Where have you seen them before? Read on...

Martin Compston

Plays: DS Steve Arnott

Known for:
Films: ‘Sweet Sixteen’.
TV: ‘Monarch of the Glen’, ‘Red Road’, ‘A Guide to Recognising Your Saints’, ‘In Plain Sight’ and ‘The Ice Cream Girls’.

Vicky McClure

Plays: DS Kate Fleming

Known for:
Films: ‘Hummingbird’, ‘Svengali’, ‘Filth and Wisdom’. TV: ‘This Is England’ series ‘Broadchurch’, ‘The Replacement’.

Adrian Dunbar

Plays: Chief Superintendent Ted Hastings

Known for:
Films: ‘My Left Foot’, ‘The Crying Game’, ‘The General’.
TV: ‘Cracker’, ‘A Touch of Frost’, ‘The Hollow Crown’.

Thandie Newton

Plays: DCI Roz Huntley

Known for:
Films: ‘Mission: Impossible II’, ‘Beloved’, ‘The Pursuit of Happyness’ and ‘Crash’
TV: ‘ER’, ‘Westworld’.

Jason Watkins

Plays: Forensic Coordinator Tim Ifield

Known for:
Films: the Nativity series, ‘Confetti’ and ‘Bridget Jones: The Edge of Reason’. TV: ‘W1A’, ‘The Lost Honour of Tim Jefferies’, ‘Being Human’, ‘Trollied’, ‘Doctor Who’.