What is the author's style in The Browning Version by Terence Rattigan?

In The Browning Version, Rattigan utilizes the unities for drama, as outlined by Aristotle in Poetics. The first unity is setting. The story is confined to one setting, the front room of the Crocker-Harris flat in 1948 at a public school in the southern part of England. The room is "gloomy," but the stage directions also indicate that it "is furnished with chintzy and genteel cheerfulness." By restricting the actions and intense emotions to this room, the confined nature of Andrew's repressed emotions and feelings and his cloying, damaged marriage are highlighted.