Conversely, he had a major critical failure with Triangle (1981–83), a soap opera set on board a ferry in the North Sea.
[4] From 1962-1967, Sellars' work for BBC television drama as a director included being assigned to the soap opera Compact and the early Doctor Who, for which he directed The Celestial Toymaker (1966).
In 1977, he found himself back to regular series work when he was given All Creatures Great and Small, which began transmission in January the following year.
Although he would produce other shows in the downtime from All Creatures—such as the poorly received soap opera Triangle and another veterinary drama, One By One—he would work on All Creatures until the end of his active career in 1990.
Sellars then lived with Alan Sandilands, moving to Spain in 2003 and entering a civil partnership the following year.