During a leaving do for veteran mechanic Dick Jones, Swiss learns that his old pal, macho salesman Trevor Webb, has run off with a younger man and set up in antiques.

Swiss is celebrating his huge new sign and salesroom when things go wrong. He is electrocuted when the sign is struck by lightning. Then his wife leaves him, forcing him to face the threat of living with his mother.

In a last ditch attempt to save his ailing car showroom, Swiss hires a troubleshooter, who soon has the whole business turned upside down. Also, Swiss's right hand man Geoff is seeing Swiss's estranged wife, Ruth.