No Love For Johnnie (1961)

Middle-aged Johnnie Byrne (Peter Finch) is a member of the British House of Commons. Johnnie's life is in disarray -- not only has his marriage failed, but he has just lost out on a top advisory position. Feeling despondent, he joins a radical political group and has a brief affair with a model, but both experiences leave him feeling even colder. He unexpectedly gets a chance to salvage his marriage, but love will have to come at the expense of his career, leaving him in a complex situation.