Jock and Australian Kevin McNab, whose horse also tested positive for the same substance, were cleared of any wrongdoing by an FEI tribunal last month.
Clifton Promise was ridden by Jock at the Alltech FEI World Equestrian Games last week, but Jock retired after an early stop cross-country to re-route to Burghley.
“He was good and having a horse like that you would like to think you can be right up the front of the leader board after the dressage,” Jock told H&H.
“Today he didn’t feel as good as he did last week at the World Championships, but it has been tough on him.”
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Sophia Heath joined Horse & Hound in July 2013 having previously worked for the Daily Telegraph's Olympics website, CNN International and Omnisport. A Durham graduate with a Masters in journalism from City University, Sophia has evented, showjumped and hunted. Sophia left Horse & Hound in early 2015 to join an international boating website.
