This week will probably be bigger.
This is where we are at:
If the Government tries to put Meaningful Vote 4 to MPs, they'll be (almost certainly) prevented from doing so by Speaker John Bercow.
Cue row between the Government and Speaker.
1/
Government brings forward Withdrawal Agreement Implementation Bill. Or WAB, the legislation underpinning our exit from the EU.
Opposition MPs need to find agreement. Key alliances need to be formed between (enough) Tory independents and Labour frontbench.
Rudd telling Sky he just wanted to close Benn Act loophole is good news for the Government.
Justine Greening (also Sky) saying she will vote for a second referendum is bad news for the Government.
3/
In other words, a referendum on PM's deal then remain loses.
A referendum on a soft Brexit and remain wins.
4/
To do that, enough Tory independents and Labour leavers (like Gareth Snell, who would potentially have backed the deal) who backed Letwin need to vote down the amendments.
But again watch out for the Speaker.
Big question about whether he will allow MV4 to be the second reading vote tomorrow.