He made his film debut in The Family Way (1966), which featured Hayley Mills, Hywel Bennett and John Mills in the leading roles. Head won a leading role in the Oscar-nominated film Sunday Bloody Sunday (1971), alongside Peter Finch and Glenda Jackson. Despite these successes, he received little public attention in the next ten years (except for his single release, "Say It Ain't So, Joe" in 1975, which has been covered by The Who's lead vocalist, Roger Daltrey, among others, including The Hollies). "Never Even Thought" has been covered by both Colin Blunstone and Cliff Richard.