"We feel that we are on the threshold of one such moment. A Yes vote for Scottish independence on Thursday would go down in history as a political and economic mistake as large as Winston Churchill’s decision in 1925 to return the pound to the Gold Standard or the failure of the Federal Reserve to provide sufficient liquidity to the US banking system, which we now know brought on the Great Depression in the US," he said. "These decisions – well-intentioned as they were – contributed to years of depression and suffering and could have been avoided had alternative decisions been taken."