The independence debate has focused attention on the future Barnett Formula, the system set up in 1979 to determine spending for Northern Ireland, Wales and Scotland. Its critics say it is too generous to the Scots, allowing them to develop better public services, and is out of date. Yes campaigners are claiming that a no vote will mean the formula will be scrapped as Westminster imposes more cuts.
More tax-raising powers for Scotland, as promised by the main Westminster parties, would inevitably raise questions about the level of, and need for, future grants from London.