- 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
- Last repeat
- Thursday 20th Oct 2016 at 10am on Gold