The constitutional structure of the United Kingdom is traditionally understood through the doctrine of the separation of powers, which allocates distinct functions to the legislature, executive, and judiciary. Within this framework, Parliament is constitutionally recognised as the supreme law-making body, a principle known as parliamentary sovereignty. The courts, in contrast, are seen as the interpreters and appliers of that law. However, the statement that courts play a ‘more important’ role than Parliament in shaping the law challenges this orthodox view. This essay will argue that while Parliament holds ultimate legal authority, the judiciary’s role in interpreting statutes and developing the common law gives it a profoundly important and arguably more dynamic function in shaping the practical content of English law. Nevertheless, the ultimate power of Parliament to create or unmake any law means its role remains fundamentally paramount, and to describe the courts’ role as ‘more important’ is an oversimplification of a complex and symbiotic relationship.
Parliament’s Supreme Law-Making Authority
The cornerstone of the UK’s uncodified constitution is the doctrine of parliamentary sovereignty. As famously articulated by A.V. Dicey, this means that Parliament has “the right to make or unmake any law whatever; and, further, that no person or body is recognised by the law of England as having a right to override or set aside the legislation of Parliament” (Dicey, 1915). This principle establishes Parliament as the highest source of law in the land. An Act of Parliament can create new areas of law, abolish existing ones, and override legal principles established by the courts through common law. For instance, the Equality Act 2010 consolidated and reformed decades of discrimination law, replacing a patchwork of previous statutes and case law with a single, comprehensive legal framework.
The judiciary is constitutionally subordinate to Parliament. The courts are duty-bound to apply statutes, and where the wording of an Act is clear and unambiguous, they must give effect to it, regardless of whether they consider the outcome to be fair or sensible. This is known as the enrolled bill rule, which confirms that once an Act has passed through the legislative process and received Royal Assent, the courts cannot question its validity (Edinburgh & Dalkeith Railway Co v Wauchope (1842) 8 Cl & F 710). A clear example of judicial deference to parliamentary will can be seen in the judicial response to the decision in *Burmah Oil Co v Lord Advocate* [1965] AC 75. In this case, the House of Lords held that the government was liable to pay compensation for the destruction of oil installations during wartime. Parliament responded swiftly by passing the War Damage Act 1965, which retrospectively nullified the court’s decision. This demonstrates Parliament’s ultimate power to have the final say, reinforcing its position as the supreme law-maker.
The Creative Role of the Judiciary in Statutory Interpretation
Despite Parliament’s supremacy, its statutes are not self-enforcing. The words of a statute require interpretation by the courts to be applied to specific factual scenarios. This interpretive function is far from a mechanical exercise and provides judges with significant influence over the content of the law. As noted by legal scholar John Bell, the need for interpretation arises because legislation cannot foresee every possible situation, and language itself can be inherently ambiguous (Bell, 1999). In giving meaning to statutory language, judges are effectively shaping how the law operates in practice.
The judiciary has developed several approaches to interpretation, such as the literal rule, the golden rule, and the mischief rule, which allow for varying degrees of judicial creativity. More significantly, the modern purposive approach requires courts to ascertain the overall purpose of the legislation and interpret its words to give effect to that purpose. This can lead to interpretations that depart from the literal meaning of the text. Furthermore, the Human Rights Act 1998 (HRA) has fundamentally enhanced the judiciary’s interpretive power. Section 3(1) of the HRA requires courts, “So far as it is possible to do so,” to read and give effect to primary and subordinate legislation in a way that is compatible with the European Convention on Human Rights. The House of Lords’ decision in *Ghaidan v Godin-Mendoza* [2004] UKHL 30 is a powerful example of this. The court used section 3 to interpret the Rent Act 1977, which gave inheritance rights to a surviving spouse living with the deceased “as his or her wife or husband,” to include surviving same-sex partners. This was a significant legal change, effectively updating the law to reflect modern social values without any new legislation from Parliament. This shows the courts actively shaping the law’s content, going far beyond a simple application of Parliament’s words.
The Development of the Common Law
A vast proportion of English law, including core areas like the law of contract, tort, and much of criminal law, is not derived from statute but from the common law. This body of law is created and developed incrementally by judges through the doctrine of precedent, where decisions in past cases bind future ones. This is an overtly law-making function. Perhaps the most famous example is *Donoghue v Stevenson* [1932] AC 562, where the House of Lords established the general ‘neighbour principle’ as the foundation of the modern law of negligence. This single judicial decision created a new area of liability that has since become one of the most significant in civil law, all without any parliamentary involvement.
The courts also use their common law power to change the law in response to evolving social and moral standards, a role traditionally associated with the elected legislature. A prominent instance is the case of *R v R (Marital Exemption)* [1992] 1 AC 599, where the House of Lords abolished the centuries-old legal fiction that a husband could not be guilty of raping his wife. The court declared that the common law was “capable of evolving in the light of changing social, economic and cultural developments” and that it was their duty to “remove a common law fiction which has become anachronistic and offensive.” In doing so, the judges directly created a new criminal liability, demonstrating a clear and important law-shaping role that operates independently of Parliament.
An Interconnected Relationship
It is clear that both institutions play a crucial role, and the assertion that one is ‘more important’ than the other is problematic. The relationship is better understood as a constitutional dialogue (Loveland, 2021). While the courts can develop the common law and interpret statutes creatively, they do so within a framework ultimately controlled by Parliament. Parliament can, and does, legislate to codify, reform, or overturn areas of common law. For example, the Occupiers’ Liability Acts of 1957 and 1984 were passed to clarify and reform the common law rules regarding the duty of care owed by occupiers to visitors and trespassers.
The HRA 1998 also exemplifies this dialogue. While section 3 gives the courts a strong interpretive power, their power is limited. If a statute cannot be read compatibly with Convention rights, the higher courts can issue a declaration of incompatibility under section 4. This declaration does not invalidate the Act but serves as a formal notification to Parliament that the legislation is in breach of human rights, putting political pressure on Parliament to amend it. This respects parliamentary sovereignty while allowing the courts to police the compatibility of legislation with fundamental rights, as seen in *Bellinger v Bellinger* [2003] UKHL 21 concerning the legal recognition of transgender individuals.
Conclusion
In conclusion, the proposition that the courts play a more important role than Parliament in shaping the law contains an element of truth, but ultimately mischaracterises the constitutional balance. Parliament’s importance lies in its political legitimacy and its ultimate legal authority as the sovereign lawmaker. It can create and destroy entire legal frameworks and has the final word in any conflict with the judiciary. However, the importance of the courts is found in their constant and direct engagement with the law. Through statutory interpretation, they breathe life into Parliament’s legislative skeleton, and through the development of the common law, they construct vast and fundamental areas of legal principle. Therefore, while Parliament holds the ultimate, sovereign power to make law, the courts perform the continuous, dynamic, and practical task of shaping its content. To call one ‘more important’ than the other is to miss the point of their distinct but deeply intertwined functions within the UK constitution. Parliament sets the stage, but it is often the courts who direct the play.
References
Bell, J. (1999) *Policy Arguments in Judicial Decisions*. Oxford University Press.
Dicey, A. V. (1915) *Introduction to the Study of the Law of the Constitution*. 8th edn. Macmillan.
Loveland, I. (2021) *Constitutional Law, Administrative Law, and Human Rights: A Critical Introduction*. 9th edn. Oxford University Press.
**Cases**
*Bellinger v Bellinger* [2003] UKHL 21
*Burmah Oil Co v Lord Advocate* [1965] AC 75
*Donoghue v Stevenson* [1932] AC 562
*Edinburgh & Dalkeith Railway Co v Wauchope* (1842) 8 Cl & F 710
*Ghaidan v Godin-Mendoza* [2004] UKHL 30
*R v R (Marital Exemption)* [1992] 1 AC 599
**Legislation**
Equality Act 2010
Human Rights Act 1998
Occupiers’ Liability Act 1957
Occupiers’ Liability Act 1984
Rent Act 1977
War Damage Act 1965
