Series 1
9 episodes transmitted between 12 Oct 61 and 7 Dec 61
Series 2
13 episodes transmitted between 30 Jun 62 and 22 Sep 62
Series 3
13 episodes transmitted between 15 Jun 63 and 7 Sep 63
Series 4
13 episodes transmitted between 4 Apr 64 and 26 Jun 64
Series 5
9 episodes transmitted between 22 Jan 66 and 19 Mar 66
Series 6
10 episodes transmitted between 1 Oct 67 and 31 Mar 68
Series 7
7 episodes transmitted between 2 Sep 68 and 21 Oct 68
Series 8
4 episodes transmitted between 27 Jul 69 and 7 Sep 69
Special
Untitled (25 Dec 69)
Series 9
7 episodes transmitted between 14 Jan 70 and 22 Apr 70
Series 10
5 episodes transmitted between 1 Jul 70 and 26 Aug 70
Special
Untitled (8 Oct 70)
Special
Untitled (25 Dec 70)
Series 11
7 episodes transmitted between 8 Apr 71 and 15 Jul 71
Series 12
6 episodes transmitted between 19 Sep 71 and 24 Oct 71
Special
Untitled (25 Dec 71)
Special
Untitled (25 Dec 72)
Series 13
12 episodes transmitted between 5 Jan 73 and 23 Mar 73
Special
Untitled (25 Dec 73)
Series 14
6 episodes transmitted between 27 Sep 74 and 1 Nov 74
Special
Untitled (25 Dec 75)
Series 15
6 episodes transmitted between 7 Jan 76 and 19 Apr 76
Special
Untitled (25 Dec 76)
Special
Untitled (25 Dec 77)
Special
Untitled (18 Oct 78)
Special
Untitled (25 Dec 78)
Special
Untitled (25 Dec 79)
Series 16
6 episodes transmitted between 3 Sep 80 and 8 Oct 80
Special
Untitled (25 Dec 80)
Series 17
7 episodes transmitted between 1 Sep 81 and 13 Oct 81
Special
Untitled (23 Dec 81)
Series 18
7 episodes transmitted between 27 Oct 82 and 8 Dec 82
Special
Untitled (27 Dec 82)
Series 19
6 episodes transmitted between 7 Sep 83 and 19 Oct 83
Special
Untitled (26 Dec 83)