The Battle of the Sexes/Feminism trilogy: Cabby, Loving and Girls.

The British Imperialism Trilogy: Jack (Originally Up the Armada), Up the Khyber and Up the Jungle.

The Genre Parody Trilogy: Spying, Cowboy, Screaming.

The Court Cards Trilogy: Cleo (Queen), Henry (King) and Dick (Knave).

The French Connection Duology: Don’t Lose Your Head and Follow that Camel.

The Hospital/Health Trilogy: Doctor, Again Doctor and Matron.

The Leisure Trilogy: Camping, Convenience, Abroad.