When the film was shown for a potential South Korean audience an audience member was visibly shocked when Nic Ray (Joanne Froggatt) cursed and threw a phone. Director Bill Clark felt that this was proof that the localisation in the subtitles was effective, but was later told that the shock was that in South Korea you simply would not hang up the phone on one's mother in law.
Despite the obvious financial incentive to shoot the film in Ireland, the production team ensured it was shot in Rutland to ensure that the story was told in the actual locations. The junction at which the ambulance hesitates is the actual junction from the original journey and the tiny home exterior was Tom and Nic Ray's actual former home.
The hospital scenes were shot in a set built inside a former Tornado bomber spraying facility at what was once RAF Cottesmore. It was cold and the sound inside was like filming in a giant tin can. The team bought as many duvets as they could find to insulate the sound as well as possible.
Epilogue: "Tom never received a reply to his letter [to his father]. Every year there are 150,000 cases of sepsis in the UK alone. More than 44,000 result in death. Greater awareness of sepsis will improve early diagnosis and can dramatically reduce these statistics (Sepsis trust dot org website). Tom is writing again. Nicola is painting again. Gracie is on her way to university. Freddie has a drum kit. He's going places."