 (1916) and the hit musical "The Boy" (1917), only rarely venturing into the world of revue ("Half Past Eight" and "Vanity Fair").His last major work for the West End was the adaptation from the German of what was to become the book to the Jean Gilbert and Vernon Duke musical "Yvonne".He subsequently did occasional work as a play doctor ("El Dorado") or an adapter through the 1920s.