Series 1
7 episodes transmitted between 13 Apr 72 and 25 May 72
Series 2
6 episodes transmitted between 11 Sep 72 and 16 Oct 72
Series 3
6 episodes transmitted between 19 Mar 73 and 23 Apr 73
Series 4
15 episodes transmitted between 12 Dec 73 and 20 Mar 74
Series 5
7 episodes transmitted between 2 Jan 75 and 13 Feb 75
Series 6
7 episodes transmitted between 17 Apr 75 and 29 May 75
Series 7
7 episodes transmitted between 11 Dec 75 and 22 Jan 76