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What is a Statutory Instrument ?

Statutory Instrument - Parliament

A statutory instrument is the most common form of secondary or delegated legislation in the United Kingdom. It allows Ministers or other authorised bodies to make detailed rules, regulations, orders, or other provisions under the authority of an Act of Parliament (primary legislation), without Parliament having to pass a completely new Act for every technical or updating measure.

Primary vs Secondary Legislation

Acts of Parliament (primary legislation) set out the broad framework and principles of the law. They are fully debated and passed by both Houses of Parliament before receiving Royal Assent.

Many Acts are intentionally framework-style, leaving detailed implementation such as technical standards, fee levels, commencement dates or procedural rules to be filled in later by secondary legislation. Statutory instruments made under these powers have the full force of law, but they derive their authority from the “parent” or “enabling” Act.

Why Use Statutory Instruments?

Parliament relies on SIs for practical reasons:

  • Efficiency — Primary legislation would otherwise become overloaded with technical detail.
  • Flexibility — Governments can respond quickly to changing circumstances (for example, updating penalty levels for inflation or implementing new safety standards).
  • Volume — Between 1,500 and 2,000 SIs are typically made each year in the UK.

SIs govern a wide range of everyday matters, from traffic regulations and immigration rules to environmental standards and tax exemptions.

How Statutory Instruments Are Made

The process is straightforward and governed by the Statutory Instruments Act 1946:

  1. The parent Act grants a specific power to a Minister (or occasionally another body) to make regulations on defined matters.
  2. Government lawyers draft the SI, often following public consultation.
  3. The Minister signs (“makes”) the instrument.
  4. It is numbered in the annual series (e.g., SI 2026/123) and published on the official legislation website.

Parliamentary Scrutiny: Affirmative, Negative and Other Procedures

The level of parliamentary oversight is set by the parent Act:

  • Negative procedure (most common): The SI is laid before Parliament and comes into force automatically after 40 sitting days unless either House passes a motion to annul it (“pray against”). Successful annulments are rare.
  • Affirmative procedure: The SI (often laid in draft) must be actively approved by resolution of both Houses (or the Commons alone for certain financial matters) before it can be made or come into force.
  • No procedure (or “made negative” in some cases): Many technical or minor instruments, such as simple commencement orders, require no further parliamentary step.

All SIs that are subject to procedure are accompanied by an Explanatory Memorandum in plain English. They are scrutinised on technical grounds by the Joint Committee on Statutory Instruments (JCSI).

Judicial Oversight and Challenges

While Parliament provides the primary political check on SIs, the courts play an important constitutional role through judicial review. Unlike primary legislation (which cannot be struck down by the courts), secondary legislation such as statutory instruments can be declared invalid if it is found to be unlawful.

The main grounds for judicial review of an SI include:

  • Ultra vires (lack of vires / illegality): The instrument goes beyond the powers granted by the parent Act. Courts interpret enabling powers strictly, especially so-called Henry VIII clauses (powers allowing Ministers to amend or repeal primary legislation).
  • Procedural impropriety: Failure to follow mandatory consultation, laying procedures, or other rules set by the parent Act or the Statutory Instruments Act 1946.
  • Irrationality / unreasonableness: The decision is so unreasonable that no reasonable Minister could have made it (applied cautiously).
  • Uncertainty: The instrument is so unclear or vague that it cannot be understood or applied.
  • Incompatibility with Convention rights under the Human Rights Act 1998 (where the parent Act does not prevent removal of the incompatibility).

If a court finds an SIs unlawful, the usual remedy is a quashing order that renders the instrument void from the outset. Parliamentary approval does not prevent judicial review.

Examples of Statutory Instruments

Common examples include regulations updating driving licence rules, housing standards or environmental protections; orders setting or amending penalty levels; and commencement regulations that bring sections of a new Act into force.

In October 2013, the Treasury laid before Parliament a short statutory instrument, in relation to Sir Keir Starmer.

Officially known as The Pensions Increase (Pension Scheme for Keir Starmer QC) Regulations 2013, the measure came into force on the 31st October 2013.

Where to Find Statutory Instruments

You can browse current and historical SIs on the official UK legislation database and Parliament’s dedicated Find a Statutory Instrument website.

Further Reading

Summary

Statutory instruments are a vital and routine part of the UK legislative system. They enable detailed and responsive law-making while remaining grounded in parliamentary authority.

Although they receive less public attention than primary Acts, they constitute the bulk of the rules that affect daily life. They remain subject to both parliamentary scrutiny and judicial oversight to ensure they stay within lawful bounds.

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[post_title] was last updated on the 9th June 2026

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