Thoburn v Sunderland City Council (also known as the "Metric Martyrs case") is a UK constitutional and administrative law case, concerning the interaction of EU law and an Act of Parliament. It is important for its recognition of the supremacy of EU law and the basis for that recognition. Though the earlier Factortame had also referred to Parliament's voluntary acceptance of the supremacy of EU law, Thoburn put less stress on the jurisprudence of the ECJ and more on the domestic acceptance of such supremacy; Lord Justice Laws suggested there was a hierarchy of "constitutional statutes" that Parliament could only expressly repeal, and so were immune from implied repeal.