6. The relationship between EU and national law

Abstract

This chapter focuses on the relationship between EU law and national law. It first explores the jurisprudence on what is known as the doctrine of supremacy of EU law of the Court of Justice of the European Union (CJEU). When a national court observes that a national law clashes with an EU law, they must set aside that national law. The EU legal order would not work without a doctrine like supremacy: not only would domestic courts not be compelled to apply EU law instead of conflicting national law, but it is likely that different domestic courts would take different decisions as to whether to apply EU law over national law in a given scenario. The chapter then considers how supremacy has been received in Germany and the UK, looking at how the German and UK legal orders interact with EU law. It then addresses whether ‘parliamentary sovereignty’ is compatible with EU membership, and examines the impact of Brexit on the supremacy of EU law.