Theresa May has made clear that immigration control is the redline in the UK's negotiation with the EU. She might as well say there is no negotiation to be had: we know the EU is not going to offer a deal of any consequence that does not involve free movement of people.
And we also now know that despite the enormous significance of this decision that she has no intention of consulting parliament on it. With a contempt for the opinion of MPs of which Charles I would have been proud she has declared that thus is an issue on which she can decide alone.
What does this mean?
First, it means there is no meaningful negotiation position left with the EU. I feel sorry for all those civil servants being tasked with futile discussions.
Second, the UK really will be outside the single market; it is hard to see any other option.
Third, the rest of the UK's politicians needs to catch up with this reality and quickly. Jeremy Corbyn may well be delighted with this outcome, but we have no clue how he would deal with it, whilst other parties now need to embrace the new certainty and also make clear where they stand.
Nowhere is this more important than in Scotland and Northern Ireland.
But it also means that the LibDems have a role again as the only likely pro EU party other than the Greens in England.
Whikst the role of a fractured UKIP is hard to discern.
The tectonic plates of UK politics are being rewritten extraordinarily rapidly without almost an iota of ideology, let alone a plan, underpinning the change. To describe this situation as dangerous is to serioyaly underestimate the risk, not least because just when we most needed an opposition that's the last thing we will have.
Some serious thinking on how the UK will survive this situation is needed, quickly. I am not too sure how many are even engaging with it though.