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Giffard's career in the foreign service began in 1961.
He became the British Ambassador to Switzerland from 1980. He returned to London as Deputy Under Secretary of State of the Foreign and Commonwealth Office from 1982 to 1984. In 1984-1986, he was Ambassador from the United Kingdom to Japan.
- Ai no Shogen (The Flowers are fallen) by Rinzō Shiina, 1961, translated from the Japanese by Giffard
- Japan among the powers 1880-1990, 1994
- Guns, kites and horses: three diaries from the Western front, 2003
- Embassy of Japan in the UK, "The Japanese Government confers a decoration to Sir Sydney Giffard"; retrieved 2013-1-7.
- The London Gazette: . 1 October 1980. Retrieved 2013-01-7.
- The London Gazette: . 31 December 1983. Retrieved 2013-01-7.
- WorldCat Identities: Giffard, Sydney