The celebrated British Polar explorer, Land Rover ambassasor and Ladybird author talks about the importance of solar in his 2013-14 expedition – a 1,800-mile return journey to the South Pole on foot that broke the record for the longest ever polar journey on foot - retracing the steps of Captain Scott's 1911-12 Terra Nova expedition, and shares a reading of his upcoming Ladybird book, Shackleton, in which he brings to life the history, dangers and challenges of Shackleton's Endurance expedition.