There's no attempt at rehabilitation; it's just containment, and containment breeds resentment and tension. Bev, Edge, Titman, Llewellyn and the others are inmates of HM Prison Swansea, 'banged-up' for up to 18 hours a day in tiny cells, which are overcrowded and lack the most basic facilities. Worrying about their families on the outside, they pass their time in whatever way they can.