
An Act of Parliament in the UK is a law enforced in all areas of the UK where it is applicable. It creates a new law or changes an existing one. A Bill becomes an Act if it is approved by the House of Commons and the House of Lords and is formally agreed to by the reigning monarch (known as Royal Assent). Acts are also referred to as primary legislation, while secondary legislation is known as Statutory Instruments (SIs).
| Characteristics | Values |
|---|---|
| Definition | An Act of Parliament creates a new law or changes an existing law. |
| Creation | A Bill becomes an Act if it is approved by the House of Commons and the House of Lords, and is formally agreed to by the reigning monarch (known as the Royal Assent). |
| Enforcement | An Act of Parliament is a law, enforced in all areas of the UK where it is applicable. |
| Implementation | Once a Bill becomes an Act of Parliament, it is the responsibility of the appropriate government department to implement it. |
| Timing | An Act may come into force immediately, on a specific future date, or in stages. |
| Review | Three to five years after a bill has been passed, the department responsible for the act should review how it has worked in practice and submit an assessment to the relevant Commons departmental committee. |
| Amendment | Acts are amended by subsequent legislation. |
| Citation | Acts passed before 1 January 1963 are cited by session and chapter. Acts passed on or after 1 January 1963 are cited by calendar year and chapter. |
| Examples | Important acts in UK constitutional history include the Magna Carta, the Treason Act 1351, the Succession to the Crown Act 1533, the Laws in Wales Acts 1535-1542, the European Communities Act 1972, and the Human Rights Act 1998. |
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What You'll Learn

How an Act becomes law
An Act of Parliament creates a new law or changes an existing law. An Act is a type of primary legislation, which is a law enforced in all areas of the UK where it is applicable. It 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.
The process of taking a Bill through Parliament begins with drafting. Once the drafters feel they have a clear idea of the policy, they will send drafts to the relevant departmental lawyers. The lawyers will discuss the drafts with the relevant policy officials and send comments back. The process of drafting and commenting on drafts will continue until the drafters and the department are happy with the result.
A Bill may be introduced into either House of Parliament but must pass through both to become an Act. Most bills will need to go through several stages in each House before becoming law. This includes a purely formal stage where the title of the bill is read out, and a debate on the main principles of the bill. A government minister will open the debate by setting out the case for the bill and explaining its provisions.
Both Houses must agree on the text of a Bill before it can become an Act. This means that if the Bill is amended in the second House, it must return to the first House for those amendments to be considered. This stage is often called "ping pong" as the Bill may move backward and forward between the two Houses a number of times before agreement is reached. The time taken to go through all of these stages depends on the length of the Bill, how controversial it is, and whether it needs to be passed quickly.
Once a Bill has passed all stages in both Houses, the Monarch signs the Bill and it becomes an Act of Parliament. This is known as Royal Assent. The Act may come into force immediately, on a specific future date, or in stages. The date of Royal Assent is published in the Act, but the Act does not necessarily come into force at this time. Most provisions in an Act will come into operation within a set period after Royal Assent (commonly two months later) or at a time fixed by the government.
Three to five years after a Bill has been passed, the department responsible for the Act resulting from it should review how it has worked in practice and submit an assessment to the relevant Commons departmental committee. The committee will then decide whether to carry out a fuller post-legislative inquiry into the Act.
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Royal Assent
In the UK, an Act of Parliament is a law enforced in all areas of the UK where it is applicable. An Act 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 received Royal Assent from the Monarch.
When Royal Assent is given, an announcement is made in both Houses – by the Lord Speaker in the Lords and the Speaker in the Commons. At prorogation (the formal end of a parliamentary session), MPs are summoned to the Lords chamber to hear the Lords Commissioners announce Royal Assent for the bills passed towards the end of the session that had not received Royal Assent earlier in the year.
The legislation within a bill may come into effect immediately, after a set period, or only after a commencement order by a government minister. A commencement order brings into force the whole or part of an Act of Parliament at a date later than the date of the Royal Assent. If there is no commencement order, the Act will come into force from midnight at the start of the day of the Royal Assent.
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Primary and secondary legislation
In the United Kingdom, primary legislation can take several forms, including an Act of Parliament, an Act of the Scottish Parliament, a Measure or Act of the Senedd, or an Act of the Northern Ireland Assembly. An Act of Parliament is a law enforced in all areas of the UK where it is applicable. It creates a new law or changes an existing one. An Act is a Bill that has been approved by both the House of Commons and the House of Lords and has received Royal Assent from the Monarch.
Secondary legislation, also known as subordinate or delegated legislation, is made by the executive branch within the boundaries set by the primary legislation. It is created when an Act delegates additional law-making powers to a body or person other than Parliament. In the UK, secondary legislation is made in the form of Statutory Instruments and Regulations, with the main purpose of supplementing, administering, supporting, and enforcing primary legislation. The process of making secondary legislation is less complex and time-consuming than that of primary legislation, providing flexibility and speed in addressing changing circumstances or unforeseen problems.
The British English terminology of primary and secondary legislation differs from American English due to differing philosophical perspectives on the fusion of powers. In representative democracies, primary legislation is created by the legislative branch, while secondary legislation is typically enacted by the executive or judicial branches.
In Spain, for example, primary legislation comprises laws and organic laws, with the latter expanding upon constitutionally delegated matters such as electoral law. Secondary legislation, or legislative decrees, can only delegate authority to the government for a specific topic, within a time limit, and only once.
In conclusion, primary legislation sets out broad principles and rules, while secondary legislation creates more specific regulations and procedures to implement them. While primary legislation is created by legislative bodies, secondary legislation is enacted by the executive or other delegated bodies, providing flexibility and speed in addressing changing circumstances.
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Acts and devolution
An Act of Parliament creates a new law or changes an existing law. It is a Bill that has been approved by both the House of Commons and the House of Lords and has received Royal Assent from the Monarch. Acts of Parliament make up what is known as Statute Law in the UK.
Devolution is the process of transferring power from the central government (Westminster) to the nations and regions of the UK. The UK's system of devolution is asymmetric, with different parts of the country having different forms and degrees of power. Scotland, Wales, and Northern Ireland have executive and legislative devolution, while some mayors in England, such as the Mayor of London, have only executive powers.
The legislative frameworks for devolution in the UK were originally set out in the Scotland Act 1998, the Government of Wales Act 1998 (later superseded by the Government of Wales Act 2006), and the Northern Ireland Act 1998. These Acts established devolved legislatures with powers previously held at Westminster, and any further changes to these laws would be made through the passing of another Act or delegated legislation.
The UK Parliament can still legislate in devolved areas, but under the Sewel Convention, it "normally" seeks the consent of the relevant devolved body before doing so. The UK's system of devolution is also different from federalism, as the devolved powers ultimately reside in the central government, and the state remains a unitary state.
In terms of the legislative process, when a bill applies to Wales or extends to Scotland, Northern Ireland, or England's devolved regions, it may be necessary to consult the devolved administration. This process of consultation ensures that the interests and perspectives of the devolved regions are considered in the creation of new laws or amendments to existing ones.
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Reviewing and repealing an Act
An Act of Parliament is a law enforced in all areas of the UK where it is applicable. It creates a new law or changes an existing one. An Act is a Bill that has been approved by both the House of Commons and the House of Lords and been given Royal Assent by the Monarch.
Reviewing an Act
The UK government is not responsible for implementing legislation, but its committees can investigate how well an Act is being implemented and the effect that the new law is having. Three to five years after a bill has been passed, the department responsible for the resulting Act should review its effectiveness and submit an assessment to the relevant Commons departmental committee. The committee then decides whether to conduct a fuller post-legislative inquiry into the Act.
Repealing an Act
An Act can be repealed so that its provisions no longer apply. Parliamentary committees examine UK laws and recommend the removal of outdated legislation. Repeal of an Act can be express or implied. Express repeal occurs when express words are used in a statute to repeal an earlier statute. Implied repeal occurs when two statutes are mutually inconsistent, and the later statute pro tanto repeals the earlier one.
The Law Commission is an independent body that keeps the law of England and Wales under review and recommends reform where it is needed. It publishes Statute Law Repeal Reports, which recommend the repeal of obsolete statutes. The UK Houses of Parliament switched from hand-writing Acts of Parliament to printing them in 1849.
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Frequently asked questions
An Act of Parliament is a law, enforced in all areas of the UK where it is applicable. An Act creates a new law or changes an existing law.
A Bill is not an Act of Parliament. A Bill becomes an Act if it is approved by the House of Commons and the House of Lords, and is formally agreed to by the reigning monarch (known as the Royal Assent).
The texts of most Acts of Parliament as originally passed by Parliament since 1800 are available on the Legislation.gov.uk website. The Parliamentary Archives has copies of original Acts from 1497. Acts passed before 1963 are cited by session and chapter, and those passed after 1962 are cited by calendar year and chapter.











































