His writing revolutionized the music of composer John Ireland while other testifying admirers have included Oscar Wilde, H. G. Wells, Siegfried Sassoon, John Betejeman, film-maker Michael Powell, cellist Julian Lloyd Weber, and Barry (Dame Edith) Humphdes. Through his stories of the supernatural and his reworking of the Arthurian Grail legend and his Angel of Mons series he became a cult figure in America, while The Terror made him the precursor of recent quasi-scientific novels in which animals conspire to destroy Mankind.