That Uncertain Feeling is a 1985 BBC miniseries based on the Kingsley
Amis novel. The story satirizes life in a small Welsh town and with a
storyline following librarian John Aneurin Lewis (Denis Lawson) as he
begins to cheat on his wife (Brenda Blethyn) with Mrs. Gruffydd-Williams
(Sheila Gish), the wife of a powerful local official (David Calder).