Ernest Shackleton was the quintessential Edwardian hero. A contemporary - and adversary - of Scott, he sailed on the 'Discovery' expedition of 1900, and went on to mount three expeditions of his own. Like Scott, he was a social adventurer; snow and ice held no particular attraction, but the pursuit of wealth, fame and power did. Yet Shackleton, and Anglo-Irishman who left school at 16, needed status to raise money for his own expeditions. At various...