London is arguing that it could better manage the oil and gas reserves there than an independent Scotland could. Credit Pool photo by Andy Buchanan LONDON — They have disagreed over whether an independent Scotland could retain the British pound as its currency. They have sparred over whether Scotland would remain in the European Union if it votes in September to leave the United Kingdom. And on Monday, two of the most prominent advocates of the arguments for and against Scottish independence — Alex Salmond, Scotland’s first minister, and David Cameron, the British prime minister — turned to another crucial economic issue at stake in the battle: the future of the still-substantial oil and gas reserves in the North Sea. In a staged but striking symbol of their differences, Mr. Cameron brought the British government’s cabinet to Aberdeen, a once gritty […]