At the 2012 Summer Olympics he competed in the Individual and Team eventing, but fell during the cross-country event and did not finish.
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The individual competitions were dominated by the British double Olympic champion Charlotte Dujardin, riding Valegro, winning her first European titles and edging out 2011 double individual champion Adelinde Cornelissen.
At the 2012 Summer Olympics, he tied with Scott Brash and Nick Skelton, both of the United Kingdom, for fifth in individual jumping.
The individual eventing event, part of the equestrian program at the 2004 Summer Olympics, was held from 15 August to 18 August 2004 in the Olympic Equestrian Centre on the outskirts of Markopoulo in the Attica region of Greece.
Germany won silver and the Netherlands took bronze.
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.