The Tower recording was produced by Joe Meek in 1963, along with four other tracks (these other tracks were relased on UK Columbia, against Tom Jones' will). The two UK Columbia 45s ("Little Lonely One/That's What We'll All Do" and "Lonely Joe/I Was A Fool) were released in 1965, in a bid to cash in on Tom Jones' fame with "It's Not Unusual" hitting the No. 1 spot. "Chills & Fever" on Tower was released in 1966, ONLY in the USA (for reasons we will probably never know).
The Decca cut of Chills & Fever was released in 1964, as Tom Jones' first UK single.