Ain't Misbehavin' is a British sitcom that aired on BBC1 from 20 March 1994 to 14 February 1995.
It stars Peter Davison and Nicola Pagett and was written by Roy Clarke, the writer of Last of the Summer Wine and Keeping Up Appearances.
Clive believes her only after spying on Melissa and Dave together, and even contemplates suicide.
He and Sonia then join forces to split up the affair, but they do not know that Melissa and Dave haven't actually committed adultery yet.
Sonia and Clive hire a private detective called Chuck Purvis.