Afghanistan veterans Captain Martin Hewitt (29), Captain Guy Disney (28), Sergeant Steve Young (28) and Private Jaco Van Gass (26) have all suffered debilitating injuries, including the loss of limbs, during active service. Now they are attempting the first unsupported trek by wounded soldiers to the North Pole for the charity Walking With the Wounded, to raise money for fellow service men and women returning injured from the front line. The charity’s patron Prince Harry is with the team for the first leg of the expedition, pulling his own sledge, sharing tent-pitching and food preparation duties and facing the same gruelling Arctic conditions as his fellow servicemen.