In 1963, he collaborated with Harold Adamson in writing songs for the movie The Incredible Mr. Limpet, which came out in 1964, and such songs as "I Wish I Were a Fish", "Be Careful How You Wish" and "Deep Rapture" enhanced his fame.
Pada tahun 1963, dia berkolaborasi dengan Harold Adamson dalam menulis lagu untuk film The Incredible Mr. Limpet, yang keluar pada tahun 1964, dan lagu-lagu seperti "I Wish I Were a Fish" , "Be Careful How You Wish" dan "Deep Rapture" meningkatkan ketenarannya.