As posturing over Brexit has given way to negotiations, the European Court of Justice is looming large. The prospects for EU citizens resident in the UK, uncertain enough to begin with, have been obscured by the government’s insistence that ECJ judges won’t be determining their rights. Even the court’s regulatory role over nuclear research is one judicial pretension too many for London: Theresa May has committed the UK to withdrawing from the European Atomic Energy Community as well as the EU, because the ECJ sorts out Euratom disputes.