The Mistress.

The Mistress is a British sitcom that aired on BBC2 from 1985 to 1987. Starring Felicity Kendal and Jane Asher, it was written by Carla Lane. The Mistress features Kendal playing Maxine, a young florist who is having an affair with a married man, whose wife was played by Jane Asher. It was disliked by some viewers, who were unhappy at seeing Felicity Kendal, who was best known as the innocent Barbara Good, playing a woman sleeping with someone else's husband.