Jon-Allan joined the RAF in 2002 and served in Afghanistan and Iraq in his role as a Weapons Technician. It was while serving in Iraq in 2007 that he was involved in a rocket attack on Basra Air station. As a result of the injuries he sustained doctors carried out an above the elbow amputation on his left arm.
Jon-Allan joined the British Para-cycling Development Programme via Battle Back, a joint scheme between the British Paralympic Association and the Ministry of Defence which helps wounded service personnel return to an active life with the help of adventurous training and sport. Jon-Allan attended a Paralympics GB taster day in October 2007 and impressed coaches on their Wattbike test, only two months after he lost his arm. After completing rehabilitation Jon-Allan started training with the team in April 2009.
At his first UCI Para-Cycling Track World Championships in Montichiari, Italy, in 2011, Jon-Allan won gold and set a new world record in the C5 kilo.
He defended this title at the 2012 World Championships ensuring selection for his first Paralympic Games at London 2012. He enjoyed a successful event, finishing the competition with three silver medals in the C4-5 1km time-trial, C5 individual pursuit and the C1-5 mixed team sprint.
After London 2012, Jon-Allan added to his medal tally at the 2014 UCI Para-cycling Track World Championships in Aguascalientes, Mexico winning a silver and bronze in the C5 kilo and individual pursuit.
Jon-Allan then took a break from competition and competed in Channel 4 show The Jump in early 2015. He returned to the Great Britain Cycling Team at the end of 2015, making his return at the Manchester International.
He was then selected for the fourth World Championships of his career in 2016 and won mixed team sprint gold alongside Louis Rolfe and Jody Cundy and a silver medal in the C5 kilo at the velodrome in Montichiari.
At the Rio 2016 Paralympic Games Jon-Allan narrowly missed out on a medal in the kilo, finishing fourth, but did later claim gold as part of the mixed sprint team.
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