Scottish leader warns Cameron that a united Britain could be 'on borrowed time'

Scotland's first minister warned on Friday that a united Britain was "on borrowed time" unless Prime Minister David Cameron devolved more powers to Edinburgh, on the first anniversary of a historic independence referendum.

Scottish voters decided to stay part of the United Kingdom by 55-45 margin on Sept 18, 2014, but First Minister Nicola Sturgeon told supporters that she would favor another referendum if polls showed renewed public demand.

"Only the people can decide if we will have another referendum," the Scottish National Party leader said in the anniversary address.