Since I've got the knack of cut-and-paste now,here's Lostshow's list of missing episodes of A Chance to Meet...
Lostshows has:
20.04.1979 Episode No. 3 (missing)
05.12.1979 With Bruce Forsyth (missing)
12.12.1979 Episode No. 5 (missing)
24.04.1980 With Frankie Vaughan (missing)
29.04.1980 Episode No. 8 (missing)
30.04.1980 Episode No. 9 (missing)
11.06.1980 With Stirling Moss (missing)
16.07.1980 Episode No. 11 (missing)
12.11.1980 Episode No. 12 (missing)
03.12.1980 Episode No. 13 (missing)
09.12.1980 Episode No. 14 (missing)
08.04.1981 Episode No. 15 (missing)
30.04.1981 With Emlyn Hughes (missing)
06.05.1981 With John Mills (missing)
24.06.1981 With Muddy Waters (missing)
16.09.1981 With Jonjo O'Neill (missing)
25.11.1981 With Brian Rix (missing)
04.05.1982 With Jackie Stewart (missing)
21.07.1982 With Tommy Trinder (missing)
15.09.1982 With Mollie Sugden (missing)
25.11.1982 With Lance Percival (missing)
01.12.1982 With Noele Gordon, Tony Adams (missing)
31.03.1983 With Tommy Trinder (missing)
14.07.1983 With Noele Gordon, Tony Adams (missing)
11.08.1983 Episode No. 29 (missing)
The Muddy Waters,Stirling Moss,and Tommy Trinder (1982) ones are on Youtube.