Series 1 – 9 November 1979 (source) to 29 February 1980 (source)
Series 2 – early 1981 (source: listings for 13 March in RTÉ Guide; definitely over by 24 April)
Series 3 – from 8 January 1982 for at least 12 weeks – 12 episodes, disrupted in February by general election coverage (source: RTÉ Guide)
Series 4 – from 7 January 1983 to 25 March 1983 (source: RTÉ Guide)
