Where we go is definitely unclear, but there are a few possibilities amongst many others:.

* The bill proceeds and and least one amendment is made to it that is significant enough it has to go back to the EU to see if they agree. And round the houses we go.

* Johnson is offered an extension and as he indicated, he pulls and goes back to the electorate .. As the man with a deal Parliament has said it could potentially approve, but he decided not to proceed with? Not a very comfortable position.

* The EU says no. Very unlikely, but possible. I would expect an SO24 to try to stop no-deal in some way. In extremis, amending the default from no-deal to revoke. It would be unlikely to pass, but it might be tried.

* A no confidence vote, with frantic attempts to form an alternative government. It may be impossible to agree one, but after a fortnight it would be an election, which Johnson is threatening anyway.