
Parliamentary sovereignty is a concept in the constitutional law of some parliamentary democracies. It is often said to be the defining principle of the British Constitution, making Parliament the supreme legal authority in the UK. This means that Parliament is the supreme lawmaker and can create or end any law. It also means that no Parliament can pass laws that future Parliaments cannot change. However, the notion of parliamentary sovereignty has been challenged over time, and some argue that it is incompatible with the rule of law. The rule of law is a principle that holds that every person and body, including the state, are subject to the law. This raises the question: can the rule of law be reconciled with parliamentary sovereignty?
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What You'll Learn

The Human Rights Act and parliamentary sovereignty
The Human Rights Act 1998 (HRA) and parliamentary sovereignty have been subjects of much debate in the UK, with some arguing for a reconciliation of the two and others for their separation.
The HRA does not grant UK courts the power to strike down primary legislation made by the Westminster Parliament. However, it does require the government to make a statement on the compatibility of any proposed laws with HRA rights. This means that while the government can acknowledge a proposed law's incompatibility with human rights, Parliament still retains the authority to pass it. This demonstrates how the HRA upholds parliamentary sovereignty.
On the other hand, the HRA has been seen as a challenge to parliamentary sovereignty. For instance, the HRA requires courts to interpret legislation in accordance with Convention rights, which may conflict with the doctrine of implied repeal and parliamentary sovereignty. In such cases, a Declaration of Incompatibility can be issued by the courts, flagging the incompatibility of a law with the HRA. While this does not automatically change the law, it does initiate the process of parliamentary reconsideration. This dynamic between the HRA and parliamentary sovereignty has been referred to as the ''autonomous conception', where the courts act as a counterweight to Parliament.
The relationship between the HRA and parliamentary sovereignty is further complicated by the UK's adherence to the European Convention on Human Rights (ECHR) and the jurisdiction of the European Court of Human Rights. While the UK remains part of the ECHR system, it incurs obligations that cannot be ignored. However, the Conservative Party has indicated its intention to reform this dynamic, making rulings of the European Court of Human Rights non-binding over the UK Supreme Court and reducing the Court's role to an advisory one.
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Parliamentary sovereignty in the UK constitution
Parliamentary sovereignty is often described as the most important part of the UK constitution. It is a principle that makes Parliament the supreme legal authority in the UK, which can create or end any law. This means that, in theory, Parliament could repeal any law. Parliamentary sovereignty is exclusive to the UK Parliament and does not extend to the Scottish Parliament, the Senedd or the Northern Ireland Assembly.
The UK is often said to have an 'unwritten constitution', but this is not strictly true. While it may not exist in a single text, large parts of it are written down in the laws passed in Parliament, known as statute law. Therefore, the UK constitution is often described as 'partly written and wholly uncodified'. This means that, unlike in other countries, there is no written constitution to bind Parliament to act in a certain way.
The concept of parliamentary sovereignty has been challenged by the European Communities Act 1972, the Human Rights Act 1998, and other legislation. For example, Section 3 of the Human Rights Act 1998 requires UK courts to practice "reading down" to apply national law consistently with the European Convention on Human Rights. This aims to preserve parliamentary sovereignty by minimising conflicts between UK law and the ECHR, without allowing courts to strike down primary legislation. However, if a court decides that a law passed by Parliament does not support the rights in the HRA, they can issue a Declaration of Incompatibility, which is not binding upon Parliament.
Some scholars argue that parliamentary sovereignty and the rule of law are autonomous principles, while others argue that they are interlinked. The former view suggests that the courts act as a counterweight to Parliament, interpreting statutes to protect the rule of law. However, this view has been criticised as placing courts on constitutionally shaky ground and presenting them as engaged in creating new norms. The alternative view sees the rule of law as a way to ascertain legislative intent, rather than challenging it.
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The role of the courts in 'qualifying' parliamentary sovereignty
Parliamentary sovereignty is a principle of the UK constitution, which makes Parliament the supreme legal authority in the UK, with the power to create or end any law. It is often described as the 'defining principle of the British Constitution'. Generally, the courts cannot overrule its legislation, and no Parliament can pass laws that future Parliaments cannot change.
However, the role of the courts in qualifying parliamentary sovereignty has been a subject of debate. Some scholars and judges have questioned the traditional view that Parliament cannot bind itself, arguing that it can impose procedural restrictions on itself. The Human Rights Act 1998, for example, requires the government to make a statement on whether any laws they propose to Parliament are compatible with the rights outlined in the Act. If a court decides that a law passed by Parliament does not support the rights in the Human Rights Act, the courts can issue a Declaration of Incompatibility. This does not automatically change the law but serves as a flag for human rights incompatibility, and Parliament retains the right to violate the rule of law so long as it uses 'express language or necessary implication'. This demonstrates how the tension between parliamentary sovereignty and the rule of law can be managed.
The notion of parliamentary sovereignty has been challenged over time, particularly with the Parliament Act 1911, which altered the nature of what was meant by Parliament. More recently, the devolution of power to bodies like the Scottish Parliament and Senedd Cymru, the UK's membership of the European Union from 1973 to 2020, and the establishment of the UK Supreme Court in 2009 have influenced the debate around parliamentary sovereignty. While these developments do not fundamentally undermine the principle of parliamentary sovereignty, they have shifted the balance of power and raised questions about the role of the courts in interpreting and applying the law.
In conclusion, while parliamentary sovereignty remains a fundamental principle of the UK constitution, the role of the courts in qualifying this sovereignty is important in protecting the rule of law and ensuring that legislative intent aligns with the basic values of liberal democracy. The courts' interpretation of statutes and their ability to issue declarations of incompatibility serve as a check on parliamentary power and help uphold human rights and the rule of law.
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The autonomous conception and its criticisms
The autonomous conception treats parliamentary sovereignty and the rule of law as independent principles. It assumes that the two sometimes clash, and that the courts must 'qualify' parliamentary sovereignty to protect the rule of law. This qualification is distinguished from abandoning parliamentary sovereignty altogether on the basis that Parliament retains the right to violate the rule of law as long as it uses 'express language or necessary implication'.
This conception has been criticised for presenting the courts as a counterweight to Parliament, likening statutory interpretation to a game of 'cat and mouse'. This places the courts on constitutionally shaky ground as it unreasonably expects Parliament to second guess how the courts will respond to its enactments. It also presents the courts as creating new norms where they deem parliamentary sovereignty to be in need of 'qualification' – essentially a legislative function.
However, these criticisms may be met if we understand public law adjudication as simply the ordinary interpretation of legislation in politically-charged circumstances. What might be seen as a new hurdle might, in fact, be nothing more than an articulation of how a deeper principle, already embedded within the law, applies to a novel set of facts.
A further criticism of the autonomous conception is that it assumes that legislative intention can be determined without reference to what the rule of law requires. This attitude is evident in Privacy International, where Lord Carnwath declared that, when dealing with statutes that threaten the rule of law, the courts do not engage in ‘ordinary statutory interpretation’, and that ‘Parliament’s intentions [are] beside the point’. However, this approach is not consistent with the way in which statutory interpretation operates in ‘ordinary’ cases.
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Parliamentary sovereignty and devolution
Parliamentary sovereignty, also called parliamentary supremacy or legislative supremacy, is a concept in the constitutional law of some parliamentary democracies. It is often said to be "the defining principle of the British Constitution". It holds that the legislative body has absolute sovereignty and is supreme over all other government institutions, including executive or judicial bodies. This means that the legislative body may change or repeal any previous legislation and is thus not bound by written law or precedent.
In the UK, parliamentary sovereignty means that the Westminster Parliament is the most important and powerful institution in the UK constitution. Its will overrides that of any other institution, including the courts, international organisations, or the devolved legislatures. This means that Acts of the Westminster Parliament are the highest form of law in the UK, even overriding international Treaty obligations.
However, the devolution of power to local legislatures in Scotland, Wales, and Northern Ireland has complicated this picture. While these bodies can pass primary legislation within their devolved areas, their powers ultimately stem from the UK Parliament and can be withdrawn unilaterally. This raises questions about how to reconcile the concept of parliamentary sovereignty with the increasing devolution of power.
One interpretation is that while the devolved legislatures have the power to modify Acts of the Westminster Parliament as they apply in their respective nations, this power is limited by the fact that Westminster legislation is hierarchically superior. This means that Westminster can still enact legislation that contradicts the interpretations or modifications of the devolved legislatures. Another interpretation is that the more we regard the Westminster Parliament as sovereign, the more difficult it will be to facilitate a devolution settlement where governments and legislatures work together effectively.
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Frequently asked questions
Parliamentary sovereignty is a principle of the UK constitution. It makes Parliament the supreme legal authority in the UK, which can create or end any law. Generally, the courts cannot overrule its legislation and no Parliament can pass laws that future Parliaments cannot change.
The rule of law is a principle that means that every person and body, whether public or private and including the state, are subject to the law.
It is often assumed that legislative sovereignty is incompatible with the rule of law. However, some argue that parliamentary sovereignty and the rule of law are essentially interlinked. The tension between the two principles is said to be managed by the courts, which qualify parliamentary sovereignty to protect the rule of law.











































