The even bigger debate starts here...

If, as seems likely, Scotland has rejected independence, the debate will range far beyond its borders.

David Cameron's already announced plans to make a statement on Friday morning, on the future government of Britain. Not just Scotland - Britain.

What will he say? Presumably he'll thank those Scots who tipped the balance in favour of the union. He'll also need to acknowledge the perceived weakness of the No campaign -- maybe he'll shock us all and thank Gordon Brown for saving the day (OK, maybe he won't).

But it's also starting to look like the Prime Minister is determined to seize the initiative on a wider debate on the way we are governed.

Should a Scotland with more devolved power still send 59 MPs to Westminster? Should they vote on issues that don't affect their constituents? And if Scotland can make its own choices on big issues like health and welfare, why can't London? Or Manchester?

It's a debate that could be a big part of next year's general election campaign. And the Prime Minister clearly isn't wasting any time trying to steer that debate in his chosen direction.