
The UK's unwritten constitution is based on a principle of parliamentary sovereignty, which means Parliament can make or change any UK law, and that laws made by Parliament (Acts of Parliament) take precedence over other types of law. However, some argue that it is the government, not Parliament, that has the final say about what the law is in the UK, as the government decides what Acts of Parliament will be made and what they will say. Parliament can change common law, which is a body of unwritten laws based on legal precedents established by the courts. Common law is primarily developed through judicial decisions rather than statutes, and it is deeply rooted in stare decisis, which means to stand by things decided.
| Characteristics | Values |
|---|---|
| Can Parliament change common law? | Yes, Parliament can change common law. |
| What is common law? | Common law is a body of unwritten laws based on legal precedents established by the courts. |
| What is an Act of Parliament? | An Act of Parliament creates a new law or changes an existing law. An Act is a Bill that has been approved by both the House of Commons and the House of Lords and given Royal Assent by the Monarch. |
| Can Parliament make law on any subject? | Yes, Parliament can make law on any subject and can change or overturn any earlier Acts of Parliament. |
| Can Parliament end any law? | Yes, Parliament can end any law. An Act can be repealed so that its provisions no longer apply. |
| Can Parliament make better law than the government or courts? | Yes, Parliament makes better law than the government or courts because there is a whole process of examining and debating the Act of Parliament in both the House of Commons and the House of Lords. |
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What You'll Learn

Parliamentary sovereignty
While Parliament can make laws on any subject, it is important to note that Acts of Parliament are not the only source of law in the UK. Common law is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means that courts follow precedents established by previous decisions. Common law is particularly useful when there is no statute law, or written law, that applies to a particular situation. However, statute law always overrides common law.
There are also two ways in which courts may limit the final say that Parliament has about law in the UK. Firstly, through the interpretation of law made by Parliament, taking into account what Parliament intended when making the law, ensuring that Acts of Parliament are in line with constitutional principles, and interpreting Acts of Parliament in a way that aligns with human rights. Secondly, binding precedent set by superior courts, such as the Court of Appeal or the Supreme Court, can overturn previous precedents.
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Acts of Parliament
Parliamentary sovereignty makes it easier to change laws to keep up with a changing world. However, some argue that Parliament is controlled by the government, which decides what Acts of Parliament will be made and what they will say. Additionally, the government has control over how Parliament spends its time and can influence how MPs vote.
Courts may limit Parliament's final say on laws in the UK through the interpretation of Acts of Parliament. Judges must consider what Parliament intended when making the law, ensuring it aligns with constitutional principles and human rights protected by the European Convention on Human Rights.
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Government control
In the UK, Parliament can make laws on any subject and can change or overturn any previous Acts of Parliament. Laws made by Parliament, or Acts of Parliament, take precedence over all other types of law, including common law. Common law is a body of unwritten laws based on legal precedents established by the courts. It is deeply rooted in stare decisis, which means "to stand by things decided", where courts follow precedents established by previous decisions. However, statute law, or Acts of Parliament, always overrides common law.
While Parliament has the power to change common law through Acts of Parliament, it is important to note that the government wields significant influence over Parliament and the law-making process. The government typically controls over 50% of the MPs in the House of Commons due to the UK's system of electing governments. These MPs often vote according to the government's wishes. Additionally, the government decides which Acts of Parliament will be made and what they will contain.
Parliamentary sovereignty facilitates the adaptation of laws to keep up with societal changes. However, critics argue that it gives too much power to the government, potentially neglecting the rights of minorities, children, asylum seekers, and other underrepresented groups. To address this concern, there have been calls for limits on the laws Parliament can make to protect the rights of all people.
Courts also play a role in interpreting and applying Acts of Parliament. Judges consider the intention behind the law and ensure alignment with constitutional principles and human rights. Parliamentary committees can examine UK laws and recommend the removal of outdated legislation. Additionally, Acts of Parliament can be amended or repealed through secondary legislation, allowing for modifications with lesser parliamentary scrutiny.
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Court limitations
Parliament can make laws on any subject and change or overturn any previous Acts of Parliament. Laws made by Parliament, or Acts of Parliament, take precedence over all other types of law, including court decisions. However, there are two ways in which courts may limit the final say of Parliament on laws in the UK.
Firstly, courts may interpret the law made by Parliament. This involves judges in court cases deciding what an Act of Parliament means. They must consider what Parliament intended when making the law, which can be complicated. Secondly, courts ensure that Acts of Parliament align with the most important principles of the constitution, such as the rule of law and rights protected by common law. They must also interpret Acts of Parliament in a way that respects human rights protected by the European Convention on Human Rights.
Courts play a crucial role in interpreting and ensuring the compatibility of Acts of Parliament with constitutional principles and human rights. This interpretation of Acts of Parliament by the courts can lead to changes in the law over time.
In some civil law jurisdictions, the judiciary does not have the authority to invalidate legislative provisions. For example, after the fall of the Soviet Union, the Armenian parliament, with USAID support, adopted new legal codes that the judiciary could not effectively adjudicate under common law principles. In such cases, the judiciary is limited to applying the code as written, without the power to invalidate or overrule problematic provisions.
In conclusion, while Parliament has the power to make and change laws, courts play a crucial role in interpreting and ensuring the compatibility of those laws with constitutional principles and human rights. The judiciary's ability to interpret Acts of Parliament can lead to changes in the law over time, demonstrating the limitations on Parliament's power in the UK's legal system.
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Common law origins
Common law, also known as judicial precedent, judge-made law, or case law, is deeply rooted in the Latin phrase 'stare decisis' which means "to stand by things decided". This means that common law is primarily based on precedent, or judicial rulings made in previous similar cases.
Common law originated in the practices of the courts of the English kings in the centuries following the Norman Conquest in 1066. It established a unified legal system, gradually replacing the local folk courts and manorial courts. The English common law, therefore, originated in the early Middle Ages in the King's Court (Curia Regis), a single royal court set up for most of the country at Westminster, near London.
The degree to which common law drew from earlier Anglo-Saxon traditions such as the jury, ordeals, the penalty of outlawry, and writs – all of which were incorporated into the Norman common law – is still a subject of much discussion. Additionally, the Catholic Church operated its own court system that adjudicated issues of canon law, which included much of what would today be regarded as family law.
In time, a rule, known as stare decisis (or precedent), developed, whereby a judge would be bound to follow the decision of an earlier judge. This replaced the pre-Norman system of local customs and varying laws in each locality with a system that was common throughout the country, hence the name "common law".
Many former colonies continue to retain the common law system today. These common law systems are legal systems that give great weight to judicial precedent, and to the style of reasoning inherited from the English legal system.
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Frequently asked questions
Yes, parliament can change common law. Statute law, or Acts of Parliament, always override common law.
Common law is a body of unwritten laws based on legal precedents established by the courts. It is also known as case law or judge-made law.
Common law is changed through the creation of a new statute law by parliament. Common law can also be changed by a superior court, such as the Court of Appeal or the Supreme Court, overturning a previous binding precedent.
Common law is based on precedents and judicial rulings made in previous similar cases. Civil law, on the other hand, is based on written rules and statutes.











































