NovelsSome Put Their Trust in Chariots (1973)Crosswords from Peking (1975)The Bulgarian Exclusive (1976)The Chinese Assassin (1978)Saigon (1982)The Prime Minister Was a Spy (1983)A Novel of Chinas Revolution 1921-1978 (1988)The Bangkok Secret (1990) based around the real-life mysterious shooting death of Thailand's King Rama VIIIThe Naked Angels (1990)A Gallery of Nudes (1992)Tokyo Bay (1996)The German Stratagem (1998)

Short story collectionsA Man Alone (1972)What is the Universe In? (2003)

Hostage in Peking (1970) recounting his experiences in Chinese captivityTowards Homosexual Emancipation (1992)The Limits of Language (1993)Hostage in Peking Plus (2008)The Secret Diary of a Two-Year Ordeal in China (2009)

He has also published various stories and articles in such magazines as Playboy, Punch and The Illustrated London News.

Between 1974 and 1979 he was a presenter on Twentyfour Hours, a daily international affairs programme on the BBC's World Service.

He has also produced television documentaries for the British TV stations BBC and ATV World. These include Return to Peking in which he describes changes in China since his imprisonment, and Return to Saigon, in which he visited Vietnam for the first time, subsequent to his successful novel Saigon.

In the late 1980s Grey's experience as a political hostage led him to found Hostage Action Worldwide, which worked for the release of other political hostages, in particular John McCarthy, Brian Keenan, Terry Waite and others held by Islamic groups in the Middle East.From the 1990s Grey took an interest in UFOs. He produced a three-part documentary in 1996-1997 for the BBC World Service entitled 'UFO's - fact, fiction or fantasy?'. His conclusion was that there is overwhelming evidence for visitations to earth by extra-terrestrials.

From the late 1990s Grey became a member of the Raelian Movement, founded by Claude Rael, which claims life on earth was genetically engineered by extra-terrestrials.

In 1970 Grey married Shirley McGuinn (16 December 1932 - 24 November 1995), his girlfriend at the time of his imprisonment in China. They had two daughters, and divorced in 1992. From 1969 to 1973 the Greys lived in Jersey, and subsequently in London, West Sussex and Norwich.

An archive of material relating to Grey is held at East Anglia University