MPs opposed to a no-deal Brexit will make an almost-final attempt early this coming week to make it impossible for Boris Johnson - if he becomes PM - to prorogue or suspend parliament to force through a no-deal Brexit.
The plan which has been designed largely by Dominic Grieve, the senior Tory MP and former attorney general, would amend the Northern Ireland (Executive Formation bill) - which is due to be debated on Monday - to force the government in October to make an oral statement on the progress of efforts to restore fully devolved government to Northern Ireland.
If the amendment were to pass, it would mean the House of Commons would have to sit in October.
It would therefore be impossible for the new prime minister to prorogue parliament or send MPs home in the days before the October 31 official date that the UK is scheduled to leave the EU.
So if the amendment is accepted, it would give MPs who hate a no-deal Brexit an opportunity in October to pass a law that would bind the new PM to leave the EU only with a deal - which would in theory make a no-deal Brexit impossible.