Died of heart attack in his dressing room during a performance of 'Loot'.
Leonard was left-handed, as can be seen during an episode of "The Fall and Rise of Reginald Perrin" (1976).
Well-known for his strict professionalism and competitive streak. He was a perfectionist when it came to acting, and was known to be a difficult actor to work with despite his affectionate and flamboyant personality.