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The 2016 referendum on the UK’s membership of the EU has led to much questioning of the place of the referendum in the UK’s constitution with a particular emphasis on the status of Parliamentary and popular sovereignty. Some commentary suggests that the UK has shifted from a constitution of Parliamentary sovereignty to one of the popular sovereignty. Drawing on A.V. Dicey’s discussion of the UK constitution in his Introduction to the Law of the Constitution, this article sets out the case that the referendum is the site of a change in the UK’s constitution. However, according to this case, the change is not accurately described as a shift from Parliamentary to popular sovereignty. It is better understood in terms of the emergence of a new constitutional convention which has altered the manner by which Parliament, as the legal sovereign, is kept subordinate to the ‘people’ as the political sovereign. The article offers some preliminary empirical assessment of this case for constitutional change and indicates areas for future research. These include considering the possible influence of democratic constitutionalist thinking in the UK’s use of referendums and the desirability and implications of a full transition to democratic constitutionalism.
