So this morning politicians and the BBC are finally dropping the rhetoric and admitting clearly that Parliament cannot stop Brexit occurring in March whether or not there’s a deal. Former Labour minister Yvette Cooper seems to think that good old fashioned civil war era brinkmanship is the way to deal with this - her wheeze is to propose an amendment to the finance bill (which enacts the budget), constraining some of the government’s tax raising powers in the event of a ‘no deal’, unless Parliament has explicitly authorised it.
https://www.bbc.co.uk/news/uk-politics-46789565