Season 1 ITV1 , 1968 Watch now Season 2 ITV1 , 1969 Season 3 ITV1 , 1970 Season 4 ITV1 , 1970 Season 5 ITV1 , 1971 Season 6 ITV1 , 1971 Season 7 ITV1 , 1973 Season 8 ITV1 , 1974 Season 9 ITV1 , 1976