While the Brexit deal has been signed off by the EU27 leaders, getting it through Westminster will be tricky, with a catastrophic and chaotic no deal Brexit by default, not design, still a distinct possibility. But even if the deal is signed off, there are effectively no upsides for the UK. It is a loss of economic integration, and thus growth and jobs, as well as political power. And the next phase in the negotiations will be even more difficult, given that this will be the worst trade deal in history with no benefits from increased trade but only costs from the disintegration of the existing common market.