First broadcast - 5 October 1969 - 11 January 1970

First broadcast - 15 September 1970 - 22 December 1970

First broadcast - 19 October 1972 - 18 January 1973

First broadcast - 31 October 1974 - 5 December 1974

First broadcast - 1971 and 1972 (German specials)

First broadcast - 9 October 1999 (BBC2)