- Part of
- Production company
- Theme tune composed by Max Harris. Introductory sentencing performed by Ronnie Barker.
- Laugh track
- Live studio audience
Pilot episode filmed on location in Wales.
The front gate is of the Main Gate House, of former St Albans Prison, Victoria Street, St Albans, Hertfordshire.
The communal areas of the prison were filmed in a water tank at Ealing Studios.
External scenes were filmed at various London psychiatric hospitals.
Most of the other interior scenes, such as Fletcher's cell, were filmed at BBC Television Centre.
- First broadcast
- Sunday 1st April 1973 on BBC Two at 8:15pm
- Last new broadcast
- Friday 25th March 1977 on BBC One at 8:30pm
- Upcoming repeats
- Series 1 Episode 2: Tomorrow at 10:10am on Gold
- Series 1 Episode 2: Tomorrow at 5:20pm on Gold
- Series 1 Episode 3: Wednesday at 10:15am on Gold
- Series 1 Episode 3: Wednesday at 5:15pm on Gold
- Series 1 Episode 4: Thursday at 10:10am on Gold
- Series 1 Episode 4: Thursday at 5pm on Gold
- Series 1 Episode 5: Friday at 10:10am on Gold
- Series 1 Episode 5: Friday at 5pm on Gold