Forty-four years after the Falklands War, tensions between Britain and Argentina are rising again. This time, the prize is oil. With up to 1.7 billion barrels at stake, Argentina is threatening legal action against companies developing the Sea Lion field, while Britain is standing firm. Sam Volkering examines the escalating dispute, Ed Miliband's surprising defence of offshore drilling and the potentially enormous energy resources that could explain why neither side is backing down.