It's rather a special edition of Newsnight tonight. Exactly 300 years after the Scottish parliament voted for the Act of Union we're being allowed into the Hall where the vote took place to have a debate of our own. We're devoting the whole programme to discussing the future of the Union - will England, Scotland, Wales and Northern Ireland see another century, let alone three, as United countries? Our opinion poll for the programme would seem to suggest that a majority don't think it will.