Back to Brexit: as decision-day approaches we try to work out what might happen next. Did Labour patch up its differences? Can anyone really start the negotiations again? And what would it take to get the EU to deviate from its script? Plus we explore some of the ideological roots of Tory opposition to Chequers and we ask what happened to the good old British bye-election. With Helen Thompson, Chris Bickerton and Waseem Yaqoob.