Boris Johnson is off to see the Queen to become her 14th (!) British Prime Minister, but where might he be taking the country this autumn? We try to work through the various Brexit scenarios, from a renegotiated Withdrawal Agreement to a crash no-deal exit. Can the backstop be issue? Plus we explore whether an early election or a second referendum can really provide a way out of the mess. Something's got to give - what will it be? With Helen Thompson, Catherine Barnard and Chris Bickerton.