The High Court judgement definitely stirs things up.
The UK Government has said it will appeal to the Supreme Court and it appears that the key question is about the notion of irreversibility. The thinking being that invoking Article 50 is an irrevocable action and so Parliament must speak on it.
It is entirely possible that the Supreme Court would push the question to the European Court of Justice (it is, after all, a question about EU law). The irony of pro-Brexit folk wanting the European Court to rule against Parliamentary sovereignty has not been lost.
Assuming the decision does need to go to Parliament there is a few givens.
Firstly, it is inconceivable that the Conservative party won't be whipped to vote
to invoke Article 50. There has been strong rhetoric about Brexit meaning Brexit and it would be bizarre in the extreme if the Government didn't require its members to vote to invoke. There will, though, be some dissenters.
Secondly it is highly likely that the Liberals and the Scottish National Party will not vote to invoke. The former because it's very pro-EU, the latter because Scotland voted to remain.
So that leaves the Labour party. It is very hard to say whether they will whip or give a free vote. If whipped it will almost definitely to invoke Article 50 based on a will of the people argument. A free vote may be called if there is expected to be a large number of dissenters.
Whatever way it goes it is likely, though not certain, that the Commons will vote to invoke Article 50.
And then it will go to the House of Lords. Since the Conservative win in May last year, the Lords have voted against important Government legislation a number of times either causing it to be pulled or requiring significant amendment.
The Lords can't actually stop a Bill going through if the Government wants it, there are mechanisms to effectively force things. However, it can make life exceedingly difficult. This raises the curious prospect of an unelected chamber delaying or obstructing a law that is based on a direct popular referendum. I can't even begin to imagine the constitutional ramifications that that raises.
So, in summary, interesting times. Glad it's not about anything actually important. Oh wait...