A graduate of Christ Church, Oxford, Addleshaw was called to the bar in 1893. He was an admirer and friend of Roden Noel. He wrote articles, poems and reviews for various publications and, under the pseudonym of Percy Hemingway published Out of Egypt, a volume of short stories (1894) and The Happy Wanderer and other Poems (1895).
- The Literary World, Volume 57, (1898) James Clarke & Co., London
- Stedman, Edmund Clarence, ed. (1895). A Victorian Anthology, 1837–1895: Selections Illustrating the Editor's Critical Review of British Poetry in the Reign of Victoria, Volume 1. Houghton Mifflin. p. 679. Retrieved 18 August 2016.
- Addleshaw, Percy (1895). "Out of Egypt: Stories from the Threshold of the East".
- Addleshaw, Percy; Hemingway, Percy (1896). "The Happy Wanderer: & Other Verse".
- A Victorian Anthology, Houghton, Mifflin and Company (1895)