Overview
| Season | Episodes | Originally aired | DVD release dates | Discs | |||
|---|---|---|---|---|---|---|---|
| Region 2 | Region 1 | Region 4 | |||||
| Series 1 | 13 | January 1974 - March 1974 | 17 July 2006 | — | — | 4 | |
| Series 2 | 12 (Episode 3 'Nowhere For The Kids' missing) | January 1975 - April 1975 | 6 April 2009 | — | — | 4 | |
| Series 3 | 16 | September 1975 - December 1975 | 8 March 2010 | — | — | 4 | |
| Series 4 | 17 | September 1976 - December 1976 | 30 June 2011 | — | — | 5 | |
| Series 5 | 13 | January 1978 - April 1978 | 7 November 2011 | — | — | 4 | |
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