Guy Herbert de Boisragon-Dent (1892-1954), who wrote as Guy Dent, was an author of adventure stories and of one science fiction novel: Emperor of the If (1926). This describes two of the possible universes created by a disembodied brain in a laboratory: one is a world in which Britain never suffered from the Ice Age, and the second is a dystopia where humans are dominate by self-reproducing machines. See the Encyclopedia of Science Fiction. I have not yet found any biographical information apart fro the very scanty data contained in his War Experiences.
Science Fiction and Fantasy Writers in the Great War 