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Garcia Thompson and Grotowski were selected to compete for Great Britain at the 2012 Summer Olympics after being chosen ahead of Gregg Weaver and Jody Gooding.
Wilson was initially selected as a reserve rider for Great Britain at the 2012 Summer Olympics but was added to the squad for the individual and team eventing when Piggy French withdrew after her horse DHI Topper W suffered an injury.
As hosts Great Britain qualified six athletes automatically; a team of three men, one of whom competed in the singles, and a team of three women, one of whom competed in the singles.