In 2011, Cocker won the 2011 British Open Championships, represented Great Britain at the FILA 2011 European Wrestling Championships held in Dortmund (Germany), was selected to compete in the 2012 London Olympics test event (unable to compete due to injury) and placed second in the 2012 British Open Championships. During 2013 Cocker again won the British Open Championships (the first Team England qualifier for the 2014 Commonwealth Games) beating the Poland international T. Bujak 7–0 in the final before being selected to represent Great Britain at the FILA International Olympia Tournament in Greece where he secured a bronze medal. In 2014 Cocker won a silver medal in the English Open Wrestling Championships (120 kg category) before dropping to the 97 kg weight category and winning the British Closed Wrestling Championships.