Competitor bio:

Derek Spence is a Kiwi living in the UK with a passion for extreme endurance events. He has completed multiple marathons, Ironman races, rowed across the Atlantic, and taken on the Marathon des Sables three times. Now adding another adventure to his list, Derek is also raising funds for the Thames Valley Air Ambulance — a vital service providing advanced medical care and rapid emergency response. You can support his efforts here: justgiving.com/page/derek-777-for-7000-for-tvaa.