## Introduction

Statutory interpretation is about giving practical meaning to Acts of Parliament and applying them to real disputes. The purposive approach asks what Parliament set out to achieve and interprets the words of the statute to give effect to that aim. It builds on the older mischief rule from Heydon’s Case and sits alongside the literal and golden rules.

Modern UK interpretation has been shaped by two strong influences:

- EU law, which favoured a teleological (purpose-driven) method to secure the aims of directives and regulations.
- The Human Rights Act 1998 (HRA), which requires courts to read legislation, so far as possible, in a way compatible with Convention rights.

This guide explains how to identify legislative purpose, when and how to use extrinsic materials such as Hansard, and the limits on reading words in or out. It also sets out leading cases you can rely on and a practical method you can use in advice, drafting, and litigation.

## What You'll Learn

- How the purposive approach differs from literal and golden rules
- How to identify the “mischief” and the statute’s aim
- When you can refer to extrinsic materials (Pepper v Hart)
- How EU and human rights law influence interpretation
- Key authorities: Pepper v Hart, R (Quintavalle), Ghaidan v Godin-Mendoza, Litster
- Practical steps to argue for (or against) a purposive reading
- Limits and safeguards to respect parliamentary sovereignty and legal certainty

## Core Concepts

### From Text to Purpose: The Main Approaches

- Literal approach
  - Start with the ordinary meaning of the words in context.
  - Fosters certainty and predictability.
  - Can produce outcomes that frustrate the statute’s aim if words are read narrowly.

- Golden approach
  - Permits a departure from the literal meaning to avoid absurdity or inconsistency.
  - Used sparingly.

- Mischief rule (Heydon’s Case)
  - Identify: the common law before the Act; the defect or mischief; the remedy Parliament provided; and the true reason of the remedy.
  - Focuses attention on the problem the statute was designed to solve.

- Purposive approach
  - Seeks an interpretation that best advances the statute’s purpose within the scheme and language of the Act.
  - Employs both internal (within the Act) and, where permitted, external (extrinsic) materials to identify purpose.
  - Does not give a licence to rewrite clear words or depart from the statutory scheme.

Tip: Purpose and text are not rivals. Start with the text, read it in its context, then test candidate meanings against the statute’s aim.

### Finding Purpose: Internal and External Aids

- Internal aids
  - Long and short titles
  - Preambles and purpose clauses (where present)
  - Definitions sections and interpretation provisions
  - Headings, side notes, and structure of Parts and Schedules
  - The Act’s overall scheme and coherence

- External aids (extrinsic materials)
  - Explanatory Notes published with modern Acts
  - Law Commission reports and government White Papers
  - International treaties relevant to the legislation
  - Hansard (parliamentary debates) — permitted only in line with Pepper v Hart:
    - There is ambiguity, obscurity, or absurdity in the statutory wording.
    - The material relied upon consists of clear statements by the minister or promoter of the Bill.
    - The statements are relevant and are a reliable guide to meaning.
  - Post-enactment materials may be used with caution; they cannot alter the meaning Parliament enacted.

Caution: Extrinsic materials help explain context and purpose; they do not justify contradicting a clear statutory provision.

### EU and Human Rights Influences

- EU approach (pre-Brexit and for retained EU law)
  - Teleological interpretation seeks to secure the effectiveness of EU measures.
  - Conforming interpretation: courts strain to read domestic law consistently with EU obligations, so far as the statutory language and scheme allow (e.g., Marleasing).
  - UK courts applied purposive readings to meet the aim of directives (e.g., Litster; Pickstone).

- Human Rights Act 1998
  - Section 3 HRA: primary and secondary legislation must be read and given effect, so far as possible, in a way compatible with Convention rights.
  - This may involve reading in or reading down words, provided it stays faithful to the statute’s scheme (Ghaidan v Godin-Mendoza).
  - Limits exist: the interpretative duty cannot change a statutory “thrust” or introduce a choice that belongs to Parliament (Re S (Minors), and later cases).
  - If a rights-compatible reading is not possible, the court may issue a declaration of incompatibility under section 4 HRA, leaving Parliament to amend the law.

### Safeguards, Limits and Common Criticisms

- Democratic legitimacy
  - Courts must respect Parliament’s words and the statute’s structure. Purpose guides interpretation; it does not authorise judicial redrafting.

- Legal certainty
  - The clearer the wording, the stronger the case for sticking with the ordinary meaning.
  - In criminal law and taxation, courts are especially cautious about extending liability without clear words.

- Practical limits
  - Do not use extrinsic materials to override unambiguous text.
  - Avoid interpretations that produce contradictions elsewhere in the Act.
  - A purpose clause does not control detailed operative provisions where the language is clear.

- Criticisms answered
  - While some say purposive reasoning invites subjectivity, using structured steps, recognised aids, and established authorities keeps argument disciplined and predictable.

## Key Examples or Case Studies

### Pepper v Hart [1993] AC 593 (HL)

- Issue: Can courts consult Hansard to interpret ambiguous provisions?
- Held: Yes, in limited circumstances. Where the statutory language is ambiguous, obscure, or leads to absurdity, courts may refer to statements by the minister or promoter that are clear and directly relevant.
- Use it for: Supporting a purposive reading when the text is unclear and ministerial statements reliably explain the intended scope.

### R (Quintavalle) v Secretary of State for Health [2003] UKHL 13

- Issue: Whether the term “embryo” in the Human Fertilisation and Embryology Act 1990 covered embryos created by cell nuclear replacement (not known in 1990).
- Held: Yes. Reading the Act in line with its aim (to regulate embryos outside the human body) extended the term to new scientific methods.
- Use it for: Arguing that statutory terms can cover new phenomena where that aligns with the Act’s purpose and scheme.

### Ghaidan v Godin-Mendoza [2004] UKHL 30

- Issue: Rent Act succession provisions referred to a person living “as his or her wife or husband”. Did this include same-sex partners?
- Held: Applying section 3 HRA, the words were read so that the protection applied to same-sex partners. This respected the scheme while removing discrimination.
- Use it for: Showing how section 3 HRA can require reading in or reading down words to achieve Convention compatibility, subject to the statute’s structure.

### Litster v Forth Dry Dock and Engineering Co Ltd [1990] 1 AC 546

- Issue: Whether workers dismissed shortly before a transfer could rely on TUPE protections implementing an EU directive.
- Held: The directive’s aim required an interpretation that treated those workers as employed immediately before the transfer.
- Use it for: EU-conforming readings to secure the effectiveness of protections where the directive’s purpose is plain.

## Practical Applications

- A step-by-step method for advisers and advocates
  1. Start with the text: read the provision in its immediate and wider statutory context; check definitions and schedules.
  2. Identify the mischief and aim: use long title, Explanatory Notes, scheme of the Act, and relevant background materials.
  3. Consider external aids: Law Commission reports, White Papers, and (if Pepper v Hart conditions are met) Hansard.
  4. Factor in EU/HRA obligations: ask whether a conforming or rights-compatible reading is required and feasible.
  5. Generate candidate readings: propose interpretations that fit both the language and the purpose; test each for coherence with the Act as a whole.
  6. Stress limits and safeguards: explain why your preferred reading does not cross the line into rewriting; address criminal/tax caution if relevant.
  7. Present the authority: support with cases such as Pepper v Hart, Quintavalle, Ghaidan, and any sector-specific cases.

- Making a Pepper v Hart application
  - Explain the ambiguity/obscurity or absurdity.
  - Identify the precise ministerial statement and show it is clear and directly relevant.
  - Provide accurate references to Hansard and a short extract.

- Using section 3 HRA
  - Identify the engaged Convention right and the incompatibility on the natural reading.
  - Propose a reading down or reading in that resolves the incompatibility without altering the statute’s basic scheme.
  - If that cannot be done, indicate that a section 4 declaration may be appropriate.

- Drafting and policy work
  - Use clear, purpose-revealing definitions and, where suitable, purpose clauses.
  - Align headings and structure with the policy aim to guide courts to the intended meaning.
  - Anticipate new technology or practices by drafting functional terms where a narrow technical term could date quickly.

- Common pitfalls to avoid
  - Overreliance on purpose to depart from clear words.
  - Citing extrinsic materials that do not meet the Pepper v Hart criteria.
  - Ignoring wider context (e.g., related provisions, schedules, or linked regulations).
  - Forgetting special caution in penal and revenue provisions.

## Summary Checklist

- Start with ordinary meaning in context; confirm the Act’s scheme
- Identify mischief and statutory aim (use titles, structure, Explanatory Notes)
- Use extrinsic materials lawfully (Pepper v Hart conditions)
- Consider EU-conforming interpretation for retained EU law where relevant
- Apply HRA section 3; if not possible, consider section 4 declaration
- Propose a reading that fits both purpose and language; avoid rewriting
- Support with authorities: Quintavalle, Ghaidan, Pepper v Hart, Litster
- Address limits: penal/tax caution, coherence across the Act, democratic legitimacy
- Document sources and provide precise references for any external materials

## Quick Reference

| Concept                | Authority                      | Key takeaway                                                    |
| ---------------------- | ------------------------------ | --------------------------------------------------------------- |
| Mischief rule          | Heydon’s Case (1584)           | Identify defect, remedy, and reason to guide interpretation     |
| Purposive approach     | General UK practice            | Read words to advance the Act’s aim within its scheme           |
| Hansard use            | Pepper v Hart [1993] AC 593    | Allowed if ambiguity etc., and the minister’s words are clear   |
| New technology cases   | R (Quintavalle) [2003] UKHL 13 | Terms can cover new phenomena consistent with purpose           |
| HRA-compatible reading | Ghaidan v Godin-Mendoza [2004] | s.3 permits reading in/down if consistent with the scheme       |
| EU-conforming reading  | Marleasing (C-106/89); Litster | Interpret to secure effectiveness of EU measures where possible |

Legislative Intent in Statutory Interpretation