 Towards the end of the 1980s scenes filmed on the exterior set became more numerous after the show's location work switched from film to videotape in 1988, although some outdoor video shooting, using large, tethered cameras, had been trialled as early as 1977.More trials were conducted with a PSC (portable single camera) unit for the Rovers Return fire episode in 1986.In 1989 larger development of the "Coronation Street" set took place.