Stewart was the son the novelist and Oxford academic J. I. M. Stewart (1906-1994) and Margaret Hardwick (1905-1979).
J. I. M. Stewart (1906 – 1994) wrote detective fiction under the name Michael Innes.
Tangier boy, by Angus Stewart.
After writing Sandel Stewart moved to Tangier in Morocco, where he wrote a travel diary entitled Tangier: A Writer’s Notebook(1977).
In Tangier: A Writer’s Notebook, Stewart describes sharing a house with a Moroccan boy called Nin, who later married a foreign female, and later sharing a flat with a boy called Meti, who was apparently heterosexual, but who reportedly shared hugs with Stewart.