The meeting today, and the signing of a memorandum of understanding, between the leaders of the SNP, Plaid Cymru and Sinn Fein, is being hailed in nationalist quarters as landmark, historic even.

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There is significance, of course, in that for the first time since the advent of devolution, Scotland, Wales and Northern Ireland are all governed by parties whose stated destination is independence or Irish unity. Either way, they want to break up the UK.

So there’s a lot of symbolism in John Swinney, Rhun ap Iorwerth and Michelle O’Neill getting together and making very public their intentions to act as a bloc against the UK Prime Minister and his government. And there was lots of grand language in Cardiff: Westminster’s time is coming to an end, constitutional change is coming, Andy Burnham will be the last PM of a United Kingdom, and the people of Scotland, Wales and Northern Ireland have the right to decide their own future.

But those arguments, those political statements are not new. And while the optics look concerning for the PM, strip away the rhetoric, and all there is is a political agreement between party leaders who already agree on........

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