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 examined the Vale of Evesham, where he had previously resided before becoming a theatre playwright. He also demonstrated exceptional skill in adapting novels by prominent authors such as Arnold Bennett and Herman Melville. As a result of his success in Stoke, he was invited to write for the National Youth Theatre, which focused on exploring the difficulties of growing up in industrial England's working-class environment.