Peter Barkwith as a banker who's wife and daughter were kidnapped and held for ransom. She has an affair with one of the kidnappers (Charley) I am blowed if I can remember what it was called ,also no one else I know remembers it.
Looking at IMDB, it appears they were both a TV series called 'The Price together for a couple of episodes
They were also in Play for Today, a TV series in 1977 - Thompson played a character called Chet in one episode
Not sure how or what names you are searching but it's Derek Thompson who plays CharlIE Fairhead
IMDB is (i reckon) the most authorative site for tv and movie info, and one of its searches lets you find what films/tv series 2 actors/crew have worked on together http://www.imdb.com/search/common
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