My Lords, the noble Lord, Lord Forsyth, makes a good point in so far as referenda in one part of the United Kingdom clearly have implications for the others, but there would be fairly significant inconsistency. If we look at the Belfast agreement and its proposals for a referendum in Northern Ireland, it is exclusive to the people of Northern Ireland. If the carry-through from his amendment would be that the people of the rest of the United Kingdom would have to vote in that referendum as well, that would mean that there could be two different outcomes. So clearly there are difficulties.
I fear that we are trying to treat the Smith commission and the political issues swirling around it as if they were a treaty rather than a piece of domestic legislation. That is why we are getting ourselves into difficulty here. This amendment would need to be looked at very carefully because of the inconsistencies that could arise. I accept entirely that additional powers to a devolved region would affect everybody else, but, equally, a referendum regarding sovereign status is a very different thing.