Aberdeen (United Kingdom) (AFP) - The leaders of the three main British parties on Tuesday issued a joint pledge to give the Scottish parliament more powers if voters reject independence, in a final drive to stop the United Kingdom splitting.The promise, which re-iterates previous commitments, appeared on the front page of leading Scottish newspaper the Daily Record under the headline "The vow".Its appearance comes two days ahead of Scotland's independence referendum on Thursday.Printed to look like a yellowed scroll, the promise was signed by Conservative Prime Minister David Cameron, opposition Labour party leader Ed Miliband, and Liberal Democrat deputy Prime Minister Nick Clegg."We agreed that: The Scottish Parliament is permanent and extensive new powers for the Parliament will be delivered," the text read."People want to see change.