In terms of movies, the late Robert Redford was the kind of triple threat that has rarely been replicated in Hollywood. Ridiculously good-looking, a generational acting talent and a gifted director, he could, and did, do anything he wanted on the big screen. But there was one role that he wanted above almost any other, that being Jay Gatsby, the titular hero of F Scott Fitzgerald’s The Great Gatsby, which in 1974 was being developed by the Brit…