Hart was born in Khartoum, Sudan, when his father was head of English at Gordon College. He moved to England with his family when he was five years old, and attended Woodhouse Grammar School, now Woodhouse College, and read Mathematics at Royal Holloway College.
While working as an executive officer at Trinity House lighthouse authority, he set up a union branch.
In the 1980s, he was chairman, secretary and treasurer of the Polish Solidarity Campaign, the main British pro-Solidarnosc organisation, and edited a history For Our Freedom and Yours (1995). He was a prominent member of the British Humanist Association and chair of Havering Humanists.
In July 2005, he was posthumously awarded with the Polish Golden Krzyż Zasługi (Cross of Valor), and the Knight's Cross of the Order of Merit of the Republic of Poland. He has also been honoured with a memorial in Ravenscourt Park, Hammersmith, which was unveiled on 5 July 2008.
- Moszczyński, Wiktor (2005-07-26). "Giles Hart". MojaWyspa. Retrieved 2009-02-03.
- Taylor, John (2005-07-29). "Giles Hart". The Independent (London: Independent News and Media). Retrieved 2009-02-03.
- "Obituaries". The Times (London: Times Newspapers). 2005-07-28. Retrieved 2009-02-03.
- "Memorial to campaigner Giles Hart killed in 7/7 bombings unveiled". The Times (London: Times Newspapers). 2008-07-07. Retrieved 2009-02-03.
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