In early 2013 Jonnie successfully completed the Royal Marines Cold Weather Warfare Course whilst on deployment to Harstad, Norway.  He went on to join a dedicated team of marines as part of the 350th anniversary challenge. Named RM350, the challenge was to complete 350km of non-stop cross-country skiing through some of Northern Norways acrtic terrain. Averaging 30km per day, mostly self-sufficient carrying 5 days food and camping equipment. The team endured white-out blizzard conditions and extremly cold temperatures whilst completing the target distance.