Dear John is a British sitcom, written by John Sullivan. Two series and a special were broadcast in 1986 and 1987. The sitcom's title refers to "Dear John" letters, usually written by women to their partners as a means of ending a relationship. John discovers in the opening episode that his wife is leaving him for a friend. He is kicked out of his home, while still being expected to pay the mortgage, and forced to find lodgings. imdb.com