
Constitutional conventions are uncodified traditions that are followed by the institutions of a state. They are rules of the constitution that are not enforced by law courts and are non-legal, but they regulate the workings of the constitution and are therefore important to constitutional lawyers. Conventions exist to regulate the shift of power and ensure that the constitution operates in accordance with prevailing constitutional values. They are at work across all branches of government: legislative, judicial, and executive. While they are not legally enforced, they are increasingly being codified in official guidance and a few have been codified in statute.
| Characteristics | Values |
|---|---|
| Not legally enforceable | Not enforced by law courts |
| May be written or unwritten | Written conventions can be found in the Ministerial Code, Cabinet Manual, Guide to Judicial Conduct, Erskine May, and even legislation |
| Unwritten conventions exist by virtue of long-practice or may be referenced in other documents such as the Lascelles Principles | |
| Not static | Conventions can evolve and new ones can emerge, in line with changing practice and changing attitudes |
| Not limited to constitutional matters | Conventions apply to a host of other matters too, such as the responsibility of Government Ministers to Parliament |
| Conventions can also be related to Law Officer advice, such as the Law Officers' Convention | |
| Conventions can also be related to the deployment of troops overseas | |
| Conventions can also be related to the office of the Prime Minister | |
| Conventions can also be related to the granting of Royal Assent |
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What You'll Learn
- Conventions are uncodified traditions that are not legally enforced
- They regulate the working of the constitution and the exercise of power
- Conventions can arise from a single incident, practice or long-term tradition
- They are enforced on a political, professional or personal level
- The UK constitution consists of legislation, common law, Crown prerogative and conventions

Conventions are uncodified traditions that are not legally enforced
A convention, also known as a constitutional convention, is an uncodified tradition that is followed by the institutions of a state. In some states, especially those that follow the Westminster system and whose political systems are derived from British constitutional law, most government functions are guided by constitutional convention rather than by a formal written constitution.
The United Kingdom, for example, has an uncodified constitution. The constitution consists of legislation, common law, Crown prerogative, and constitutional conventions. Conventions may be written or unwritten. They are principles of behaviour that are not legally enforceable but form part of the constitution by being enforced on a political, professional, or personal level.
Conventions are significant in the UK because of the role they play within the Constitution. They exist to regulate the shift of power and ensure that the constitution operates in accordance with prevailing constitutional values. They can arise from a single incident or practice, such as when former Prime Minister Tony Blair sought a parliamentary vote to invade Iraq. This constituted a convention, or at least a step towards one, despite Blair not needing to do this as the executive has the power under the royal prerogative to take the country to war.
Constitutional conventions are at work across all branches of government: legislative, judicial, and executive. They embody a principle of responsible government or self-restraint, such as not exercising legal powers to the full, not abusing public power, and respecting the constitutional role and functions of the other branches of government.
While conventions are not legally enforced in the courts, they are still important. They are not mere legal rules, but they do regulate the workings of the constitution and are thus a concern of constitutional lawyers. They prescribe the way in which legal powers shall be exercised, transferring effective power from the legal holder to another official or institution, limiting broad power, or prescribing that a legal power shall not be exercised at all.
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They regulate the working of the constitution and the exercise of power
Constitutional conventions are unwritten rules that help regulate the workings of a country's constitution and the exercise of power by political actors. They are deeply embedded in the political culture and play a crucial role in maintaining stability and order in the political system. While not legally enforceable, these conventions carry a strong moral and political force that guides the behaviour of those in power.
One of the key functions of constitutional conventions is to ensure the smooth operation of the constitution. They provide clarity and predictability in political processes, filling in gaps or ambiguities that may exist in the written constitution. For example, in many parliamentary systems, there is a convention that the head of state, such as a monarch or president, acts on the advice of the prime minister and cabinet when exercising their powers. This convention ensures that the day-to-day governance is carried out by the elected representatives, maintaining a clear separation of powers and preventing arbitrary decision-making by the head of state.
Conventions also play a critical role in checking and balancing political power. They establish norms and limits on the exercise of power, preventing its arbitrary or excessive use. In systems with a ceremonial head of state, for instance, there is often a convention that the head of state remains politically neutral and refrains from actively involving themselves in partisan politics. This convention safeguards the impartiality of the head of state's office and prevents potential conflicts with the democratically elected government. Similarly, there are often conventions surrounding the behaviour of government ministers, requiring them to act in a manner that upholds the integrity of their office and avoids conflicts of interest.
Constitutional conventions are deeply rooted in the political traditions and historical practices of a country. They evolve over time through precedent and custom, often emerging from past political crises or controversies. For example, many countries have conventions surrounding the conduct of elections, such as the immediate resignation or dismissal of a government that loses the confidence of the lower house of parliament. These conventions ensure stable transitions of power and prevent political deadlock. By providing a framework for resolving political disputes and managing crises, conventions contribute to the overall stability and effectiveness of the political system.
While constitutional conventions are not legally enforceable, their breach can have significant political consequences. Actors who deviate from established conventions may face strong political backlash, public criticism, or loss of support. In some cases, conventions may become so widely accepted that they are eventually codified into formal legal rules. However, the flexibility of conventions also allows them to
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Conventions can arise from a single incident, practice or long-term tradition
Conventions are rules of the constitution that are not enforced by law courts. They are not laws but they regulate the workings of the constitution and are an important concern of constitutional law. Conventions can be written or unwritten and are principles of behaviour that are enforced on a political, professional, or personal level. They are inherently flexible and do not always have close or singular definitions.
Conventions can arise from a single incident, practice, or long-term tradition. For example, in 2003, Prime Minister Tony Blair sought a parliamentary vote to invade Iraq. He did not need to do this as the executive has the power under the royal prerogative to take the country to war. However, some have argued that Blair's act of seeking permission from parliament constituted a convention or was at least a step towards one. This demonstrates how a convention can arise from a single incident.
Conventions can also arise from practices or traditions. For example, the convention of the Queen giving Royal Assent to a Bill passed by Parliament has been in place for over three hundred years. This convention has been followed by successive kings and queens and is based on an understanding that they should not block legislation. Another example is the convention that the Prime Minister cannot remain in office without the support of a majority of members of the House of Commons. This convention arose from an unsuccessful attempt by the ministry of Robert Peel to govern without the support of a majority in the House in 1834-1835.
In addition to single incidents and practices, conventions can also arise from long-term traditions. For instance, the United Kingdom has an uncodified constitution that consists of legislation, common law, Crown prerogative, and constitutional conventions. The UK's constitutional arrangement includes conventions such as the expectation that the prime minister will resign if they do not command the confidence of the House of Commons and an alternative government does. This convention is not legally enforceable but has political sanctions. Over time, existing conventions may evolve and new ones may emerge in line with changing practices and attitudes, allowing for significant constitutional change without any fundamental change in the law.
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They are enforced on a political, professional or personal level
Constitutional conventions are an essential part of the UK's constitutional arrangement. They are unwritten principles of behaviour that are not legally enforceable but are enforced and play out on a political, professional, and personal level. They are at work across all branches of government: legislative, judicial, and executive.
Conventions are significant because they ensure that the constitution operates in accordance with prevailing constitutional values. They are flexible and can evolve or emerge in line with changing attitudes and practices. For example, the convention that the government would not commit troops overseas without a prior debate and vote in parliament arose from Tony Blair's decision to seek parliamentary approval for the 2003 invasion of Iraq.
On a political level, conventions are enforced through political criticism and the threat of a constitutional crisis. For example, if the Queen refused to appoint the member of the House of Commons who commands the confidence of a majority of the House as Prime Minister, it would cause a constitutional crisis. Similarly, if a minister misleads Parliament, they are expected to resign, but if they refuse to do so, they would be acting unconstitutionally, which would likely result in political criticism and pressure to resign.
On a professional level, conventions are enforced through self-restraint and responsible government. For example, the Law Officers' Convention dictates that the Law Officers' advice to the government is confidential and subject to legal professional privilege. Conventions also ensure that the different branches of government respect each other's constitutional roles and functions. For instance, the House of Lords will not normally veto secondary legislation or block bills promised in the governing party's manifesto.
On a personal level, conventions are enforced through individual responsibility to Parliament. For example, Prime Minister's Questions hold ministers individually responsible to Parliament, and the convention of collective responsibility dictates that government ministers are collectively responsible for government policy.
While conventions are not legally enforceable, they are still vital to the functioning of the UK's constitution and play a key role in regulating the shift of power and ensuring responsible government.
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The UK constitution consists of legislation, common law, Crown prerogative and conventions
The UK constitution is unique in that its core aspects are not contained in a single legal source. It is made up of various sources, including legislation, common law, Crown prerogative, and conventions.
Legislation forms a significant part of the UK constitution. Certain Acts of Parliament, such as the Human Rights Act 1998 and the House of Lords Act 1999, directly impact constitutional principles. These laws cover areas like human rights, the right to vote, the holding of elections, and the structure of the judiciary.
Common law, a key feature of the UK legal system, also plays a role in the constitution. Judges interpret and apply the law based on custom and precedent, shaping constitutional principles such as individual rights and limitations on public authorities.
The Crown prerogative refers to the powers exercised by the monarch or the executive branch of the government. These powers include creating corporations, granting charters, and making treaties. Notably, the royal prerogative is subject to the law and cannot be expanded unilaterally.
Conventions are understandings about how the constitution functions and are an essential part of the UK's system of government. They include principles such as the Prime Minister commanding the confidence of the House of Commons and the inability of the executive to declare war without Parliament. While conventions lack legal force, they provide guidelines for the functioning of the constitution.
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Frequently asked questions
A constitutional convention is an uncodified tradition that is followed by the institutions of a state. They are not enforced by law courts and are therefore considered non-legal rules. However, they are important as they regulate the workings of the constitution.
Some examples of constitutional conventions include the granting of Royal Assent, where the monarch formally agrees to make a bill into an Act of Parliament, and the convention that the Prime Minister of the United Kingdom cannot remain in office without the support of a majority of members of the House of Commons.
There is an ongoing debate about whether constitutional conventions should be made into laws. While it is possible to do so, it would be a difficult and time-consuming process. Some argue that codifying conventions would provide clarity and ensure that important constitutional matters are dealt with through constitutional law rather than convention. However, others believe that the flexibility of conventions is advantageous as they can swiftly change to adapt to rapid changes in society.











































