The phantom referendum
The theoretical possibility that the UK Government could usurp the Scottish Government and hold its own referendum on Scottish independence is one that's been kicking around ever since the SNP won its historic majority at Holyrood back in May. But one question that nobody seems to have asked is "So what?"
Much of conventional wisdom has it that only the UK Parliament has the ability to grant Scotland independence, and that the Scottish Parliament can't legally bring about the dissolution of the Union. This is essentially a fallacy, based on misunderstanding of the sovereign nature of the Scottish people, but is generally held to be an academic technicality anyway – should a referendum conducted by Holyrood indicate the desire of the Scottish electorate for independence, the idea of Westminster even attempting to refuse would in practice be unthinkable.
But were Westminster to conduct its own vote, would the situation be any different? It's hard to see how. It was recently claimed by the Tories' Lord Forsyth that Alex Salmond had told George Osborne the SNP would boycott any Westminter-led referendum. This would throw up a pretty interesting constitutional brouhaha by itself, but let's assume the referendum went ahead in 2012, the SNP did indeed refuse to collaborate in it, and let's say for the sake of argument that as a result it delivered a resounding "No" vote on a very low turnout. What then?
The UK would continue business as usual (assuming there hadn't been a civil war), and soon enough would arrive at 2015. At which point the SNP would table the referendum for which the Scottish electorate gave them an overwhelming mandate, and invite the UK Government to try to stop it.
It's difficult to identify any legal grounds on which Westminster would be able to block a referendum which the Prime Minister had repeatedly acknowledged was Holyrood's to hold. Short of Cameron sending in the tanks, the second referendum would go ahead regardless of the result of the first. The constitutional sovereignty of the Scottish people would remain unchanged, as would the unthinkability of any refusal by Westminster to accept the result. Once again, beyond military conflict there simply wouldn't be any way to keep the Union together.
(It's not even as if there isn't extremely recent precedent on these very islands for having two referenda on the same subject in the same country in close succession. Less than 16 months separated the people of the Republic Of Ireland's rejection of the Lisbon Treaty from a second vote in which it was accepted.)
So we're going to go ahead and say with some confidence that there will be no Westminster-conducted referendum on Scottish independence. That it would be democratically outrageous ought to be reason enough, let alone that it would likely be highly counter-productive, but more importantly it would be also completely pointless. Only Holyrood has a mandate for a referendum, and only Holyrood – on Holyrood's own terms – will conduct one.