He is best known for his portrayal of the character Mr. Robson in the children's television drama Grange Hill. Stuart portrayed the series' longest-serving teacher, arriving in 1988 as the new head of PE. In 1998 he finally landed the headmaster's job, but left the series in 2003 soon after production of Grange Hill transferred to Liverpool.
Prior to Grange Hill, Stuart appeared as Kevin Cross in the Mersey TV soap opera Brookside, and played Bazin in the Doctor Who story Dragonfire in 1987. Since then, he has appeared in a variety of roles on T.V., including Monk, a flasher who exposed himself to Anna and yet was defended by Miles in This Life; Richard Thornton, who stalked P.C. Sam Nixon across a double episode Special in The Bill; and Leighton Peters, a top Civil Servant who was responsible for the downfall of Anthony Calf's regular in a double episode of Holby City.