 At the Edinburgh Festival he appeared in 1970 in Middleton's "The Changeling (play)", directed by Richard Eyre, Sir David Lindsay's "Ane Satire of the Thrie Estates" (1984), and "A Wholly Healthy Glasgow", directed by Richard Wilson, in 1987.Watson’s theatre credits continued with appearances in Sam Shepard's "Fool for Love (play)" at the Royal National Theatre and in the West End of London, "In Time of Strife" at the Glasgow Citizens Theatre, "Macbeth" and "Hamlet" at the Royal Lyceum Theatre, Edinburgh, "Born Yesterday" at the Royal Exchange, Manchester, Bill Bryden's "The Ship" at Glasgow Docklands in 1990), "The Treatment" and "Some Voices" at the Royal Court Theatre, "The Government Inspector" at the Almeida Theatre, Islington, in 1997 and 1998,and "Victoria" for the Royal Shakespeare Company in 2000.Watson’s film work included "Silent Scream", "The Big Man" (1990) and Alan Rickman's "The Winter Guest".