|Representing Great Britain|
|1984 Los Angeles||4x400 m relay|
|1983 Helsinki||4x400 m relay|
He competed for Great Britain in the 1984 Summer Olympics held in Los Angeles, United States in the 4 x 400 metre relay where he won the Silver medal with his teammates Kriss Akabusi, Todd Bennett and Philip Brown.
He was a world record holder in the rarely run 4×800 m relay as a part of a quartet that also contained Peter Elliott, Steve Cram and Sebastian Coe. They ran a time of 7 minutes 3.89 seconds on 30 August 1982 at Crystal Palace.
After a successful athletics career, Cook qualified and has since practiced as a teacher specialising in Physical Education and Geography.
He is married to former fellow Olympian Kathy Cook; they have three children, Sarah (1988), Matthew (1989) and George (1992) and reside in Walsall, England.
- Kubatko, Justin. "Garry Cook Biography and Olympic Results". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 2012-10-24. Retrieved 2010-01-24.
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