Thoburn v Sunderland CC

Thoburn v Sunderland City Council [2002] EWHC 195 (Admin), commonly known as the "Metric Martyrs" case, arose from a series of prosecutions brought against market traders who persisted in using imperial measures when selling goods, contrary to regulations made under the European Communities Act 1972. The appellants, including Steve Thoburn, a Sunderland greengrocer, had continued to price and sell produce by the pound rather than by the kilogram, as required by trading standards legislation implementing European Community directives on weights and measures.

The relevant regulatory framework derived from the Weights and Measures Act 1985, as amended by the Units of Measurement Regulations 1994 and 1995, which were themselves made under section 2(2) of the European Communities Act 1972. Those regulations progressively phased out the lawful use of imperial units for trade purposes, culminating in a requirement that goods be sold and priced exclusively in metric units. Traders who refused to comply faced criminal prosecution for breach of the regulations.

The appellants were convicted before magistrates' courts and appealed by way of case stated to the Divisional Court. Their principal contention was that the subordinate legislation implementing the metric-only requirement was unlawful because, they argued, the 1985 Act had impliedly repealed or modified the enabling powers under the 1972 Act to the extent that the 1972 Act could no longer authorise regulations removing the right to use imperial measures. The case therefore raised a question of fundamental constitutional importance about the relationship between Acts of Parliament and the doctrine of implied repeal.

The appellants advanced an additional argument of considerable boldness: that the European Communities Act 1972 itself, insofar as it purported to allow Community law to take precedence over domestic statute and to authorise subordinate legislation overriding provisions of primary Acts of Parliament, was constitutionally invalid or had been impliedly repealed by subsequent inconsistent legislation. This argument invited the court to revisit the constitutional foundations of the United Kingdom's membership of the European Community and the domestic reception of Community law supremacy.

The case was heard by Laws LJ, sitting with Crane J in the Administrative Court. Laws LJ delivered the leading judgment, which has since become one of the most cited and academically influential statements of domestic constitutional principle in modern public law. The judgment addressed not only the specific statutory question but also provided a comprehensive theoretical account of the constitutional status of Acts of Parliament and the limits of the traditional doctrine of parliamentary sovereignty.

The primary issue was whether the Weights and Measures Act 1985 had impliedly repealed any part of the European Communities Act 1972, with the consequence that the subordinate regulations made under the 1972 Act were invalid and the prosecutions therefore could not be sustained. This required the court to consider whether the classical doctrine of implied repeal — that a later inconsistent statute repeals an earlier one to the extent of the inconsistency — applied without qualification to all Acts of Parliament.

The secondary issue was whether the European Communities Act 1972 was itself constitutionally valid in purporting to give effect to Community law supremacy in domestic law, and whether it could lawfully authorise secondary legislation that departed from or overrode provisions of subsequent primary Acts of Parliament. This required consideration of the nature of parliamentary sovereignty and whether Parliament possesses the capacity to modify the conditions of its own future legislative competence.

An ancillary issue concerned the proper interpretation of the Weights and Measures Act 1985 itself and whether, on its true construction, it was inconsistent with the 1972 Act in any material respect. The resolution of this interpretive question was ultimately subsumed within the broader constitutional analysis, but it remained part of the legal framework within which the appeals fell to be decided.

Laws LJ began by articulating the traditional principle of parliamentary sovereignty as understood in domestic constitutional law: Parliament may legislate on any subject, and no Parliament may bind its successors. The corollary is the doctrine of implied repeal, whereby a later statute inconsistent with an earlier one automatically repeals the earlier to the extent of the inconsistency, without any need for express words. This principle, recognised in cases such as Vauxhall Estates Ltd v Liverpool Corporation [1932] 1 KB 733 and Ellen Street Estates Ltd v Minister of Health [1934] 1 KB 590, had traditionally been treated as an absolute rule admitting of no exceptions.

However, Laws LJ rejected the proposition that the doctrine of implied repeal operates uniformly across all categories of primary legislation. Drawing on academic constitutional theory, he distinguished between what he termed "ordinary" statutes and "constitutional" statutes. An ordinary statute is one that regulates the legal relationship between citizen and state in some particular respect. A constitutional statute, by contrast, is one that conditions the legal relationship between citizen and state in a general or overarching way, or that enlarges or diminishes the scope of fundamental constitutional rights. The criterion for identifying a constitutional statute is that it "creates or alters the architecture of our constitution."

Laws LJ provided examples of statutes he considered to be constitutional in this sense. These included Magna Carta 1215, the Bill of Rights 1689, the Act of Union 1707, the Reform Acts, the Human Rights Act 1998, and — critically for present purposes — the European Communities Act 1972. The identification of these instruments as constitutional statutes was not derived from any express statutory provision but from their substantive significance in conditioning the terms of the constitutional order. This categorisation was an exercise of judicial recognition rather than legislative designation.

The consequence of this distinction, as Laws LJ elaborated it, is that constitutional statutes are immune from implied repeal. Whereas an ordinary statute may be repealed by a later inconsistent Act without express words, a constitutional statute can only be repealed or amended if a later Parliament does so expressly and unambiguously. Parliament retains the sovereign capacity to repeal any statute, including a constitutional one; but the court will not infer such an intention from mere inconsistency or from the ordinary operation of the implied repeal doctrine. This represents a qualification of, rather than a challenge to, parliamentary sovereignty.

Laws LJ was careful to distinguish his analysis from that advanced by those who argued, following the reasoning of Lord Bridge in R v Secretary of State for Transport, ex parte Factortame (No 2) [1991] 1 AC 603, that Parliament had effectively surrendered its sovereignty to Community law. Laws LJ firmly rejected any notion that the 1972 Act had entrenched Community law supremacy in a manner that placed it beyond the reach of a subsequent Parliament. The sovereignty of Parliament remains, in his analysis, a purely domestic constitutional principle: Parliament can always repeal the 1972 Act, but it must do so expressly.

Applying this framework to the specific statutory question, Laws LJ held that the Weights and Measures Act 1985 had not expressly repealed or amended the European Communities Act 1972. Because the 1972 Act is a constitutional statute, the doctrine of implied repeal has no application to it. The 1985 Act, being an ordinary statute, could not by mere inconsistency or by silence override the enabling powers conferred by the 1972 Act. Accordingly, the subordinate regulations made under the 1972 Act remained lawfully made and in force, and the prosecutions of the appellants were properly sustained.

Laws LJ also addressed the broader argument that the 1972 Act was constitutionally invalid because it purported to allow Community law to have supremacy over domestic Acts of Parliament, thereby fettering future Parliaments. He rejected this argument on the ground that it misconceived the nature of the constitutional settlement effected in 1972. The 1972 Act did not surrender sovereignty; it was an exercise of sovereignty. Parliament, acting within its plenary power, chose to confer a particular status on Community law. That choice remains always reversible by Parliament, and it is for Parliament — not the courts — to decide whether to reverse it.

Laws LJ was also alert to the theoretical tension between his two-tier model of legislation and the orthodox Diceyan position that all Acts of Parliament are equal in legal status. He acknowledged that his approach involved a significant development in constitutional thinking, but maintained that it was consistent with principle. The doctrine of parliamentary sovereignty, properly understood, requires that Parliament's intentions be respected; and where Parliament enacts legislation of fundamental constitutional importance, it must be presumed not to intend that importance to be whittled away by subsequent legislation enacted without adverting to the constitutional dimension.

The court also considered the appellants' arguments in relation to the specific wording of the 1985 Act, examining whether its provisions could be read as impliedly withdrawing or restricting the regulation-making powers conferred by the 1972 Act. Laws LJ concluded that no such implication arose on a proper construction of the 1985 Act. The statute was designed to regulate the domestic framework of weights and measures law and did not manifest any intention to qualify or override the source of regulatory authority residing in the 1972 Act. Even on ordinary principles of statutory construction, absent the constitutional dimension, the appellants' argument would not have succeeded.

Laws LJ considered the position of Community law supremacy as received into domestic law. He acknowledged that from the perspective of Community law, as stated by the Court of Justice in Costa v ENEL (Case 6/64) [1964] ECR 585 and Internationale Handelsgesellschaft (Case 11/70) [1970] ECR 1125, Community law takes precedence over all national law including constitutional provisions. However, he was clear that from the perspective of domestic constitutional law, the position is different: Community law has the status it has in the United Kingdom because, and only because, Parliament has given it that status through the 1972 Act. The ultimate foundation of Community law's domestic authority is parliamentary enactment, not any independent or autonomous legal order.

In disposing of the appeals, Laws LJ confirmed that the convictions of the appellants were correct in law. The regulations under which they were prosecuted were lawfully made and consistent with the enabling Act. The court expressed no sympathy for the appellants' position as a matter of policy or political preference, but was firm that the legal arguments they advanced could not be sustained. The case therefore ended the challenges brought by the "Metric Martyrs" through the courts, although the political controversy surrounding metrication in the United Kingdom continued beyond the litigation.

The court dismissed all the appeals. The European Communities Act 1972 is a constitutional statute which cannot be impliedly repealed by later inconsistent ordinary legislation. The Weights and Measures Act 1985 did not, expressly or by necessary implication, repeal or qualify the regulation-making powers conferred by the 1972 Act. The Units of Measurement Regulations 1994 and 1995, made under section 2(2) of the 1972 Act, were therefore lawfully made, and the prosecutions of the appellants for selling goods by imperial measures in contravention of those regulations were properly sustained.

The broader constitutional arguments advanced by the appellants — including the contention that the 1972 Act was itself invalid for purporting to entrench Community law supremacy — were rejected. Parliamentary sovereignty remains intact as a domestic constitutional principle. The 1972 Act was a lawful exercise of that sovereignty and can only be undone by an equally express and unambiguous exercise of sovereign parliamentary authority. The court confirmed that it is for Parliament, not the courts, to determine whether the United Kingdom's membership of the European Community should be brought to an end or the domestic reception of Community law supremacy modified.

Thoburn is of exceptional constitutional importance because it represents the most systematic judicial articulation of a two-tier theory of primary legislation in English law. The distinction Laws LJ drew between ordinary and constitutional statutes has been widely adopted in subsequent academic commentary and has exercised considerable influence on judicial reasoning in public law cases. It provides a framework that reconciles the formal principle of parliamentary sovereignty with the practical recognition that certain fundamental statutes occupy a qualitatively different constitutional position.

The case has been cited and discussed in a number of significant subsequent decisions. In R (HS2 Action Alliance Ltd) v Secretary of State for Transport [2014] UKSC 3, the Supreme Court referred approvingly to the concept of constitutional statutes articulated in Thoburn, noting that certain constitutional instruments stand in a special position that may limit the operation of ordinary rules of statutory construction and implied repeal. The concept has also informed the academic literature on the constitutional consequences of Brexit, particularly in discussions of whether the repeal of the 1972 Act by the European Union (Withdrawal) Act 2018 required — and provided — the requisite express parliamentary authority.

The judgment also contributes to the wider debate about whether the United Kingdom possesses an uncodified hierarchy of legal norms and whether parliamentary sovereignty, as traditionally understood, is genuinely absolute. Laws LJ's analysis suggests that the courts may already recognise, through principles of construction, a form of entrenchment for fundamental constitutional instruments that does not depend on any formal codification or amendment procedure. This has implications for debates about whether the common law itself imposes substantive limits on legislative authority, as explored in extrajudicial writings by senior judges and in cases such as R (Jackson) v Attorney General [2005] UKHL 56.

From the perspective of EU law and the domestic reception of Community law suprem