Scottish First Minister Nicola Sturgeon speaks at the Scottish National Party’s 2016 conference in Glasgow ©John Linton/PA Wire/Press Association Images

The SNP, it hardly needs saying, is now a very big party in a small country. The conference is bustling and busy with the stuff of government. Fringes earnestly debate the details of social policies: I’m writing this from the back of a packed Prince’s Trust session with deputy first minister John Swinney, where worthy questions are being asked about the operation of the apprenticeship levy.

But although the party finds itself responsible for just about everything that is going on in Scotland these days, this is only by virtue of the unexpected hegemony it has achieved since 2011, and even more particularly since the independence referendum two years ago. At heart, the SNP is not a party of everything, it is a party of nationalism. And when you catch the delegates chatting between the worthy policy discussions it is, as often as not, about the post-Brexit potential for independence.

Nicola Sturgeon’s “announcement” that draft legislation for a fresh referendum will soon be published has set the conference alight, even though it changes virtually nothing.

For a start, it is something she had already promised to do. For another thing, it is draft and not real legislation, a way of keeping options open and “the independence story” rolling forward, rather than a hard and fast pledge to make anything happen. And for a final thing, it is legally speaking really quite clear that Holyrood cannot legislate for a refere…

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