Many of his plays focused on the Vale of Evesham where Terson lived before becoming resident dramatist at the theatre. He also became an astute adaptor of novels by Arnold Bennett and Herman Melville. As a result of the success of his work in Stoke, he was invited to write for the National Youth Theatre where his work focused on growing up in the dead-end working-class culture of industrial England.
Terson's plays frequently explored the Vale of Evesham, where he had previously lived before becoming a theatre playwright. He also demonstrated exceptional skill in adapting novels by notable authors such as Arnold Bennett and Herman Melville. Following his success in Stoke, he was approached to write for the National Youth Theatre, which focused on depicting the challenges faced by young people growing up in industrial England's working-class culture.