Hargreaves attended Woolverstone Hall, a boarding school owned by the Inner London Education Authority. While still at school, he formed a band named Snapp with Tony Ajai-Ajagbe and three other school friends. In 1973 the band were signed by M&W Music Productions, which was owned by Dave Myers and John Worsley, writers of the 1971 UK Eurovision Song Contest entry "Jack in The Box" sung by Clodagh Rodgers. A single written by Myers and Worsley called "Cheat, Cheat" was released in 1974 on Cube Records.
Hargreaves and Ajai-Ajagbe developed their own songwriting skills and in 1977 they signed as Motown's Jobete Music's only UK based songwriting team. Hargreaves and Ajai-Ajagbe soon moved into producing. In the 1980s, they negotiated a label deal with Michael Levy's Magnet Records. Their label, Midas Records, was the first to release recordings by Sinitta, which Hargreaves and Ajai-Ajagbe wrote and produced. They were also the first to record Yazz as a member of the pop group The Biz.
Hargreaves and Ajai-Ajagbe wrote the 1983 season theme tune for the BBC1 daily magazine show Pebble Mill at One and the theme tune for the BBC2 show 655 Special hosted by David Soul and Sally James. Hargreaves and Ajai-Ajagbe also wrote the first single for Five Star called "Problematic". Hargreaves used his influence with the music producer of Pebble Mill at One to get Five Star on the show, which launched their career. The songwriting partnership between Hargreaves and Ajai-Ajagbe ended in 1983, shortly after they completed Sinitta's second single "Never Too Late". Tony Ajai-Ajagbe died of AIDS in 1995.
Hargreaves continued to write songs on his own. He wrote and produced Simon Cowell's first hit with Sinitta, "So Macho". which went to number 2 twice on the UK chart in 1986. He told Scotland on Sunday that "So Macho" was intended: "... for women to dance round their handbags to and for the gay scene to go mad to on poppers" and that: "I was never gay, but I had a lot of lovely friends in the gay scene." Cowell went on to describe Hargreaves as a "well known songwriter" in his autobiography I Don't Mean to be Rude, but....
Hargreaves topped the chart in Iceland with an Icelandic version of a Christmas song originally recorded, but never released, by Sinitta (with Simon Cowell singing Santa "Ho ho hoes" in the background vocals). The song "I Won't Be Lonely This Christmas" became "Heima Um Jólin" and was sung by Helga Möller.
Hargreaves' first Top 50 chart hit was "Feel Like The First Time", which reached number 45 on the UK chart in August 1986, but faded fast when "So Macho" entered the top 50 some seven month after its initial release. "Feel Like The First Time" was however Sinitta's biggest hit in the US, going top ten in the Billboard Hot Dance Music/Maxi-Singles Sales chart. The song and the production of "Feel Like The First Time" was greatly influenced by Madonna's producer Steve Bray, writer and producer of Madonna's smash hit "Get Into The Groove". Bray also co-wrote and produced the song "Baby Love" with the US singer Regina who was signed to Hargreaves' US production company West 78th Street Records. Hargreaves worked on the mix of the "Baby Love" record and gained an insight into how to make 'Madonna-sounding songs' and applied his new knowledge to Sinitta with "Feel Like The First Time". Regina's "Baby Love" reached number 9 on the US chart and was later covered by Dannii Minogue.
Church minister who wrote Sinitta's 'So Macho' wins claim over alleged homophobia - Rev George Hargreaves was shunned at work by a colleague
who ignored him after being outraged by a perceived homophobic remark he had made. (Yohannes Lowe - "Daily Telegraph" - 2 June 2020)