Yesterday's Hero - S15.E15

Tension between DS Boulton and PC Garfield over Dave Quinnan's stabbing reaches boiling point on an obbo with PC Hollis. Garfield explodes when pushed too far, and he headbutts Boulton, nearly breaking his nose. It's up to Reg to step in and help Garfield come to terms with his feelings of helplessness over the incident. PC Dave Quinnan, still at St Hugh's, resolves to help Juke, a fellow patient who claims the police have done nothing to find the person who stabbed him, although he soon comes to realise that Juke's wounds are self-inflicted.