The National Three Peaks Challenge takes in the highest mountains in Scotland, England and Wales in 24 hours.
Two service members, a gas engineer and a electrician just looking for a challenge and raising some money for charity :).
Fundraising pageThe Royal Artillery Charitable Fund assists all Royal Artillery officers, soldiers and their dependants, both serving and retired, in their time of need - whatever the cause and at any time in their lives.
Charity website23 hours 46 minutes