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Constitutional Conventions for SQE1

Part of our SQE1 Constitutional and Administrative Law guide → View the full SQE1 Constitutional and Administrative Law guide

01 Apr 2026

Constitutional conventions are non-legal rules that regulate how political power is exercised in the UK. They are politically binding but not legally enforceable. Understanding the Jennings test and the distinction between law and convention is essential for SQE1.

Constitutional Conventions for SQE1

Constitutional & Administrative Law > Constitutional Conventions

Constitutional conventions are unwritten rules that regulate how political power is exercised in the UK. They are not legally enforceable, but they are politically binding — and the SQE1 expects you to understand exactly what that distinction means. This area tests your grasp of the difference between rules that courts will enforce (law) and rules that depend on political practice (convention).

What Are Constitutional Conventions in SQE1?

Candidates lose marks on SQE1 by assuming courts will enforce conventions — they will not. A constitutional convention is a non-legal rule of constitutional practice that is considered binding on those who operate the constitution. Unlike statutes or common-law rules, conventions cannot be enforced by the courts. Their authority rests on political practice, precedent, and a sense of constitutional obligation.

Conventions exist because the UK has no single written constitution — much of the constitutional framework depends on accepted practices that have developed over time. When conventions are breached, political consequences (such as loss of office) may follow, but courts will not enforce them or award damages for breach.

Key Principles for SQE1

  • The Jennings test: for identifying a convention: (1) are there precedents for the practice? (2) did the actors in those precedents believe they were bound by a rule? (3) is there a constitutional reason for the rule? All three elements must be present. This test, from Sir Ivor Jennings, is widely used by courts and is essential for SQE1.

  • The Salisbury Convention: the House of Lords will not reject at second reading a Bill that gives effect to a commitment in the governing party's election manifesto. This convention preserves the democratic mandate while allowing the Upper House to scrutinise legislation.

  • Collective ministerial responsibility: all Cabinet ministers must publicly support government policy or resign. Dissenting in public (without resignation) breaches the convention. Ministers who cannot support a decision must leave office. This convention binds the Cabinet together.

  • Individual ministerial responsibility: ministers are accountable to Parliament for their departments and may be expected to resign for serious departmental failures or personal misconduct. The scope and application of this convention has been debated, particularly in recent cases.

  • Royal Assent: by convention, the monarch always grants Royal Assent to Bills passed by Parliament. The last refusal was in 1708. This means the monarch's role is purely ceremonial for legislation that has passed both Houses.

  • The Sewel Convention: the UK Parliament will not normally legislate on devolved matters without the consent of the relevant devolved legislature. This convention was codified in statute by section 2 of the Scotland Act 2016, but the Supreme Court held in R (Miller) v Secretary of State for Exiting the EU [2017] that it is not legally enforceable. Understanding this distinction is crucial for devolution questions and parliamentary sovereignty in the context of the UK's constituent nations. The court will not mandate compliance with it.

  • Conventions are not legally enforceable: the courts will recognise their existence but will not enforce them. This was confirmed in Attorney General v Jonathan Cape Ltd [1976] and R (Miller) [2017]. Even when a convention is breached, the courts have no power to award damages or make orders to enforce compliance.

Exam tip

The biggest SQE1 trap is confusing what is legal with what is conventional. A candidate may identify a convention correctly but then claim it is legally enforceable or that courts can award remedies for breach. Courts cannot. If the question asks what legal remedy is available for a convention breach, the answer is typically "none" — remedies are political, not legal.

How This Appears in SQE1 Questions

SQE1 questions test the distinction between law and convention. This is a classic SQE1 trap where a convention has been breached and the question asks what legal remedy is available — the answer is usually none, because conventions are not justiciable.

Questions may test the Jennings test by asking you to identify whether a practice is a convention or a legal rule. They may also test your understanding of specific conventions (particularly the Sewel Convention and collective ministerial responsibility) and whether you correctly recognise that courts cannot enforce them.

Example scenario: The UK Parliament passes legislation on a matter that is devolved to Scotland without the consent of the Scottish Parliament. This breaches the Sewel Convention. A Scottish interest group challenges the legislation in court. The court will recognise the Sewel Convention as a constitutional rule but will not enforce it or strike down the legislation. This is a classic SQE1 trap: candidates correctly identify the convention but then incorrectly assume the courts will enforce it. The courts will not.

Common Mistakes Students Make

  • Stating that conventions can be enforced by courts — they cannot; courts recognise them but do not enforce them
  • Confusing the Jennings test with other legal tests (such as standing or causation)
  • Overstating the effect of codifying a convention in statute — codification does not necessarily make it legally enforceable; the Sewel Convention is partly codified but still not justiciable
  • Assuming that a convention that is widely accepted is therefore law — convention and law are distinct; acceptance and practice do not turn convention into law
  • Forgetting that conventions can change as political practice evolves, whereas law is fixed until formally changed
  • Missing the significance of R (Miller) — the Supreme Court clearly stated that the Sewel Convention is not legally enforceable, even when recognised in statute

Quick Summary

  • Conventions are non-legal rules of constitutional practice that are politically binding but not legally enforceable
  • The Jennings test (precedent, belief in obligation, constitutional reason) identifies whether a practice is a convention
  • Key conventions include collective ministerial responsibility, individual ministerial responsibility, Royal Assent, and the Sewel Convention
  • Courts recognise conventions but will not enforce them or award remedies for breach
  • Conventions depend on acceptance and political pressure; they can change over time as political practice evolves

Want to test this now? Try a few SQE1-style questions below before moving on.

Test Yourself

Test yourself

Quick check questions based on this article.

Question 1

Scenario

Following a general election, no single political party has secured an overall majority of seats in the House of Commons. The incumbent Prime Minister's party won the most seats but fell short of a majority by 20 seats. The leader of the second largest party claims that, because the incumbent has lost the confidence of the electorate, the monarch should invite the leader of the second largest party to form a government. Constitutional commentators note that the Salisbury Convention and the Sewel Convention are not relevant to this situation. The incumbent Prime Minister does not resign immediately after the election result is declared. The Cabinet Secretary advises the monarch that, by convention, the incumbent Prime Minister is entitled to remain in office and attempt to form a government, including by negotiating a coalition or confidence-and-supply agreement. A political journalist publishes an article arguing that the convention is outdated and should be replaced by a statutory rule. The leader of the second largest party threatens to bring legal proceedings to compel the monarch to dismiss the incumbent. A constitutional law academic publishes a commentary noting that the courts have consistently declined to enforce conventions. The incumbent Prime Minister begins negotiations with a smaller party. A solicitor advises a client interested in the constitutional position.

What is the legal position regarding the enforceability of the constitutional convention on government formation?

Question 2

Scenario

A constitutional law lecturer is explaining to students the difference between constitutional conventions and legal rules. The lecturer uses the example of the convention that the monarch grants Royal Assent to all Bills that have been approved by Parliament. A student asks what would happen if the monarch refused to grant Royal Assent to a Bill. The lecturer explains that such a refusal has not occurred since 1708. Another student asks whether a court could compel the monarch to grant Royal Assent if the convention were breached. The lecturer notes that conventions play a fundamental role in the operation of the UK constitution. The class has been studying constitutional conventions for three weeks as part of a public law module. The lecturer is a former government legal adviser with 20 years of experience. The students wish to understand the legal enforceability of constitutional conventions.

Which of the following best describes the legal enforceability of constitutional conventions?

Question 3

Scenario

The Welsh Government has introduced a bill in the Senedd Cymru concerning environmental regulations that apply exclusively within Wales. The UK Government has proposed a bill in the UK Parliament that would also regulate environmental standards across England and Wales. The UK Government's bill would override certain provisions of the Welsh bill in areas that fall within devolved competence. The Secretary of State for Wales has stated that the UK Government's bill is necessary to ensure uniform environmental standards. Members of the Senedd have argued that the UK Government should seek the legislative consent of the Senedd before legislating on devolved matters. The UK Government has acknowledged the convention but argues that exceptional circumstances justify proceeding without consent. The Welsh Government has formally refused to grant a Legislative Consent Motion. A Welsh constitutional pressure group has threatened judicial review proceedings. The UK Government's bill has the support of the majority of English MPs. The Secretary of State previously served as an environment minister.

Which of the following best describes the constitutional position regarding the UK Government's bill?

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