Major changes in the cast occur with the departures of John, Stephen, Doug and Rosie Palmer, and the introduction of a fourth family in the form of the working-class O'Briens, who move in next door to the Palmers and quickly become involved in the dramas of the other characters. The Palmers experience further problems when David has an affair with Patricia's sister Margaret, which finally ends his marriage to Beryl. David's happiness with Margaret is short-lived, however, as she dies following injuries sustained in a plane crash. Lynn becomes involved with Andy Green while Kevin is working overseas, and the two fall in love, leaving Lynn confused and contemplating suicide on the edge of a cliff. Lynn eventually chooses to stay with Kevin, and they move overseas with son Davey.