Goodwin is primarily known for his film music and worked on more than 70 scores during his career. He composed his first feature film, "Man with a Gun" in 1958 and was quickly followed by "The Witness" and "Whirlpool" a year later. Early minor film success followed with several films until 1961 when he composed scores for the first of four Miss Marple films starring Margaret Rutherford, entitled "Murder, She Said" (1961). He later went on to compose for the remaining three Miss Marple films "Murder at the Gallop" (1963), "Murder Most Foul" (1963) and "Murder Ahoy" (1964). He scored two horror films, "Village of the Damned" (1960) and its sequel "Children of the Damned" (1964). His music for war films is particularly well remembered. This includes work on "633 Squadron" (1964), "Operation Crossbow" (1965), "Where Eagles Dare" (1968), "Battle of Britain" (1969), for which he (mostly) replaced William Walton, plus "Force Ten from Navarone" (1978). After requests from the Band of the Royal Air Force, the opening from "Battle of Britain", originally titled "Luftwaffe March", was retitled "Aces High" and is now regularly played by military bands in the UK.