The vote to leave the European Union and the administrative chaos surrounding British “exit” have dominated domestic debate in the United Kingdom, where “leaving the single market” is described by supporters as a seamless solution to economic and social divisions within British society. It is more accurately viewed as transforming the British state in profound and unpredictable ways, and as a countermovement against the neoliberal mode of European integration and a disruption to the single market. This discussion will review the domestic impacts for the UK of leaving the single market, the effect of Brexit on the single market in Europe, and the safeguards in place to mitigate the risks on the European single market.