It's a windy June day on Britain's tallest mountain. While the rest of the country enjoys a pleasant afternoon of sunshine, I'm wrapped from head to toe in layers of insulating hiking gear, battling the biting mountain breeze halfway up Ben Nevis.
A fellow hiker, whom I've just met and walked with, is struggling. She's not used to the mountains and complains of tired legs and a tight chest, suggesting it would be better for everyone to go on without her. Before I can offer advice, a warm voice interjects from over my shoulder.
