The series revolved around HMP Stone Park. Over the course of the series the prison had three Governors: Faye Boswell, Helen Forrester and Susan Marshall.
Ironically, the only audience unable to watch the series were real-life prison inmates: the programme aired at 9pm but the prisoners were locked in their cells half-an-hour earlier.
There is currently no known copy of Within These Walls: Nowhere for the Kids (1975) in existence. This is consequently the only missing episode of the entire run.