There was more big Brexit news last night – yes, it is relentless at the moment – as EU leaders agreed to a deadline extension. So what does this mean for our hopes of a Final Say referendum?

It means there’s even more reason to turn up to the Put it To The People march tomorrow and show that there is a decisive and rational way out of this carnage.

In fact, I can’t help but think that the extension has improved our chances, just as the new petition to revoke Article 50 has. As the news editors and I sat around waiting hours (like Theresa May herself) for the decision to come last night, we had plenty of time to consider the possible routes ahead.

Here’s just one example (let’s face it, all manner of things could take place in the next few weeks – let’s not try to run through every scenario).

So, what happens next? Let’s play the crystal ball game…

First question: do we think that the same MPs massively insulted in Theresa May’s late-night presidential address to the nation will be suddenly won over to back her deal? Probably not. That would leave us needing to find another Brexit plan by 12 April. So, do we think that MPs could agree on an entirely different Brexit plan in the next 21 days? (I’m including weekends – let’s be generous.) Maybe. But then again, given progress so far, maybe not. So if that doesn’t happen, the UK would still need a simple, clear proposal to put to the EU in order to avoid crashing out. Something that people could really get behind. So, how about a referendum?

There are, of course, other scenarios, and all are incredibly complicated. In truth, who knows what happens next. But a referendum is possible. And huge signs of public support do change the mood in Westminster. An overwhelming turnout on Saturday will make a difference.

It starts at noon on Park Lane in London before heading to Westminster.

I’ll see you there.