Parliament will now resume sitting as the suspension, or proroguing was deemed not only void, but unlawful. Boris Johnson says the court was wrong but the verdict will be respected.
Quite a stramash and we now have to think seriously about what yesterday (and indeed the last few months) mean for politics.
Firstly the decision of the Supreme Court was a constitutional moment. It overturned a load of established precedent and radically altered a part of the generally understood constitution (the nature and scope of the prerogative power). The government gave them the opportunity to do this by pushing the envelope so hard but the court decided not to go down the route of saying "look this is just pushing your luck, go back and think more carefully about what this power you exercise actually allows you to do". Instead they asserted that (as I read it anyway) the Royal Prerogative is justiciable in all instances and that it is subordinate to the explicit law as interpreted by the courts.
That is a huge change. Personally I do not like the way the UK constitution (because fundamentally it's a monarchical one rather than a republican one - you can still have a monarch in a republican constitution by the way, vide for example Sweden) gives the PM and ministers enormous power through the Crown power and particularly the RP. So in some ways I welcome the principles that the court articulates. However, this is not the way to do major constitutional change, on the fly. Moreover it is going to cause all kinds of mayhem down the line - Labour people who like it should think about the way it could be used to bugger up the school policy they have.
This makes some kind of codification of the constitution inevitable in my view. The problem is that the centre left and right will try to codify the constitution we have but they will come under enormous pressure now from people who want something radically different. This will come from the radical left but also, crucially, from the radical right that these events are creating.
Secondly, this is going to crystallise the appearance of a mass political movement of the radical right, with the support of just over a third of the voters (I would estimate). Actually stopping Brexit or even extending it past 31st October will bring it about. This will be a profoundly un-conservative, in fact revolutionary politics. Some of the key ideas or sentiments are these. The existing constitution is a confection that sustains a corrupt elite - it needs to be replaced by one that allows for direct popular sovereignty through things like referenda with binding effect and a directly elected and powerful executive.
Politics is dominated by an elite that is distinct from the actual people and part of a supranational parasitic class that needs to be brought under popular control. This 'enemy class' is not only the political class, the media, and academia. It also consists of the wealthy and big businesses. Strong hostility to the business class and the global economy will also be part of it. In my view this kind of politics and argument is going to consolidate and find expression very rapidly. People like Paul Mason are wetting themselves with excitement over the appearance of a street based politics of the radical green left but they should be thinking about the emergence of a different kind of street based mass politics that they don't like.
Thirdly, this will accelerate a large movement of money from donors to an emerging centre liberal bloc. It is currently the Lib Dems but will soon expand to include voters and others from the increasingly shattered Conservative Party. Meanwhile the Labour Party will certainly consolidate a specific voting quadrant but will otherwise come under assault from both the new force on the right and the liberal centre. Meanwhile traditional conservatism is in a really hard place. Not a good time to be a Burkean conservative. If you support that kind of approach the thing to do is probably to forget about what the Conservative Party has done since Thatcher or even Heath and think hard about what the political project of conservatism is.