Line of duty Series 4 Ep5

Hastings accuses Hilton of a wilful effort to bury allegations of wrongdoing. Hilton denies this and demands a copy of the recording of DI Matthew "Dot" Cottan's dying declaration. Hastings declines, claiming no reciprocity. At a team briefing, DS Twyler reports biometrics suggest the 'Balaclava Man' who attacked Arnott and the 'Balaclava Man' seen in the area of Collersdale's murder are the same man. Huntley says maybe, but Farmer may change his plea to guilty. Twyler has doubts and tells a colleague that Huntley is keen to pin Ifield's murder on Reznikova. Fleming tells Hastings the leak of her cover is likely to have been from within AC-12. More female body parts are discovered: they are more of Collersdale. Arnott arrives at the office in a wheelchair, returning to work despite his limited mobility. He says Huntley cannot be allowed to mislead the investigation and Hilton said nothing about AC-12 not investigating Ifield's murder. He suggests looking at Nick Huntley's alibi, to which Bindra finds it does not clear him. Bindra asks Desford for his username and password, claiming they are being changed, but uses them to enter the police system and download the recording of Cottan's dying declaration, which she passes to Hilton. Bindra then asks to take early pregnancy leave.
Fleming notes the sensitive information access and tells Hastings, who reprimands Desford. Desford says he is being scapegoated, requests a transfer and leaves the office. Arnott visits Farmer in prison, suggesting a change of solicitor; Farmer says he liked the one he had before. Arnott brings Farmer's Nan to the prison to try to prevent him from changing his plea; she succeeds. Arnott tells Fleming the framing of Farmer could not have been random and finds that Farmer's earlier solicitor was Lakewell. Arnott and Fleming visit Lakewell, but get nowhere. Huntley's wrist is beginning to stink; the doctor who took the swab tries to contact her. At home, she faints after taking off the dressing. Nick meets Lakewell, saying Huntley is lying and has a wound which dates from the night of Ifield's murder; he believes she murdered Ifield. Lakewell floats the idea of a voluntary interview and immunity. FC Rupal Pandit reveals proof the latest remains had been frozen and were buried after both Farmer's incarceration and Ifield's murder, and suggests a team briefing to Huntley. Pandit goes to the team office for the briefing, but no-one has been made aware of the information. Twyler, who hears this, meets Fleming and, stressing anonymity, relays the information. This triggers Arnott's memory: Jackie Laverty's body was buried after being kept in deep freeze and men in balaclava masks with baseball bats were involved. He suggests the Laverty case, which is unsolved, be re-opened, giving them the chance to examine the latest forensics. Huntley is in hospital. Her husband explains to her that her hand had to be amputated to save her life.
With the new forensic evidence, Arnott finds the blood sample of Ifield (relating to Leonie Collersdale's murder) was contaminated with white forensic oversuit fibres, just as the blood spatter on the kitchen counter had been; so both were falsified. He says he believes Huntley has been protecting her husband. Hastings says "to hell with ACC Hilton" and instructs Fleming to go and pick up the Huntleys, but DCI Huntley has discharged herself from hospital. Taylor picks Huntley up and tells her Lakewell has requested a voluntary interview with independent detectives about Ifield's murder, seeking immunity. Huntley meets her husband at home. She says they are getting a divorce and accuses him of amputating her hand in retribution for her having an affair. He says it was all her lies and she had MRSA in her wound. She arrests him for Ifield's murder. Once he has been taken away, Huntley reaches for the holdall she had kept with contaminated items from the scene of Ifield's murder and runs his hairbrush over one of her husband's jumpers.
Hastings, Arnott and Fleming visit Hilton. Arnott and Fleming explain evidence was planted in order to falsely implicate Ifield in Collersdale's murder and that Ifield had uncovered a conspiracy to frame Farmer for the murders. Hastings says he would like to arrest DCI Huntley on suspicion of perverting the course of justice. Hilton brushes this aside and reminds them AC-12 is recused, and that these are DCI Huntley's cases. Hastings says they came across this as a result of looking again into the disappearance of Laverty. Hilton looks disturbed by this revelation, then praises their work, but again calls for their files to be handed over to an impartial authority. Hilton tells Arnott and Fleming to leave and plays Hastings the recording of Cottan's dying declaration in which it is revealed that the top corrupt official who promoted Cottan had a name beginning with "H". Hilton tells Hastings, referring to him as "H", that he will be served with a Regulation 15 notice. Fleming drives Arnott home, discovering he is unable to look after himself. He confesses to Fleming he may never walk again; she consoles him. Before he is interviewed, Nick Huntley again tells his solicitor that DCI Huntley is lying about everything.