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"Breach" is the sixth and final episode in Series 3 of Line of Duty and the seventeenth overall episode. It was first broadcast on BBC Two on 28th April 2016.


DS Steve Arnott is arrested on suspicion of murder but continues to protest his innocence. Does DC Kate Fleming's undercover operation hold the key to Steve's guilt and the identity of the Caddy?


Part I[]

Main article: Breach Recap Part I

Part II[]

Main article: Breach Recap Part II


Opening Credits[]

Closing Credits[]

  • Maya Sondhi as Police Constable (PC) Maneet Bindra
  • Joanne Crawford as J Cerrington
  • James Edlin as PC Lambert
  • Lucia McAnespie as Custody Sergeant
  • David Ryan as Arnott's Solicitor
  • Paul Kennedy as Cottan's Solicitor
  • Patrick Buchanan as Police Sergeant (PS) Briggs


  • Chrissie Harris as Police Officer AC-12
  • Ross Moneypenny as AFO
  • Ash Cook as Young Joe Nash


Filming locations in this episode include Invest Northern Ireland HQ and Belfast BT Riverside Tower (AC-12 Building), Rosemary Street (where children get in the way of Fleming shooting Dot), Royal Avenue (en route to Dot/Fleming shoot-out) and Tates Avenue (Dot/Fleming shoot-out).


  • The sequence at the end of the episode where Fleming shoots at the distant moving vehicle was inspired by a scene in series 1 episode 7 'Close Quarters' of The Professionals, in which Bodie was held hostage and fired a sniper rifle at Cowley and Doyle's distant car.