Scotland Decides (With Westminster’s Permission): The Supreme Court’s Ruling Explained

Background: Reserved Matters and Devolution Tools

The Scotland Act 1998 reserves the Union and the UK Parliament to Westminster. Holyrood cannot legislate on matters that “relate to” these areas.

Three mechanisms protect this boundary:

• Section 31(1): ministers must certify a Bill does not encroach on reserved matters.
• Section 33: Law Officers may refer a Bill to the Supreme Court before Royal Assent.
• Schedule 6, para 34: Law Officers may refer any devolution issue not already in litigation.

The Lord Advocate used para 34 to ask the Supreme Court whether Holyrood could legislate for an independence referendum. The UK’s Advocate General argued the question was not a devolution issue and that the court should refuse the referral.

The Supreme Court addressed three questions:

• Is the reference a devolution issue?
• Should the court refuse it?
• Does Holyrood have power to legislate for an independence referendum?

1. Is the Reference a Devolution Issue?

The Advocate General made four submissions. All were rejected.

The referral arose under the Ministerial Code

He argued the Lord Advocate acted under the Scottish Ministerial Code, not the Act. Supreme Court: irrelevant. The question arose “by virtue of the Act” because it concerned legislative competence.

Section 33 is the only referral route

He argued Sch 6 should not be used once a Bill is introduced. Supreme Court: Sch 6 referrals can be made before introduction; s. 33 referrals only after introduction. Both schemes coexist.

Paragraph 1(f) should be narrow

He argued “any other question” should only cover matters not listed earlier. Supreme Court: para 1(f) is a sweep‑up clause. Ordinary meaning applies, following Imperial Tobacco.

Lord Advocate should not refer questions she can answer

He argued the referral was unnecessary. Supreme Court: Law Officers are not infallible. The issue was undecided. Referrals promote clarity.

2. Should the Court Refuse the Referral?

The Advocate General argued the Bill might change during the legislative process and lacked policy documents.

Supreme Court: although compelling in ordinary litigation, the question determined whether the Bill could be introduced at all. The Lord Advocate assured the court that relevant provisions would not materially change. Referral accepted.

3. Does Holyrood Have Power to Legislate for an Independence Referendum?

The Lord Advocate argued the Bill did not “relate to” reserved matters because:

• It created only an advisory referendum.
• “Relates to” requires a close connection.
• The Bill’s stated purpose was simply to ascertain public opinion.
• Only legal effects should be considered.

Supreme Court’s reasoning

Meaning of “relates to”

Section 29(2)(b) requires more than a “loose or consequential” connection, following Martin v Most, Imperial Tobacco and Legal Continuity. An independence referendum has a clear and direct connection to the Union and Parliament.

Purpose and effect under section 29(3)

Purpose must be assessed alongside “effect in all the circumstances”. This includes political effects. The court rejected the argument that only legal effects matter.

Applying the test

• Reserved matters: the Union and the UK Parliament.
• Purpose: to hold a lawful referendum on whether Scotland should become independent. This “evidently encompasses” reserved matters.
• Effect: significant political ramifications. The court highlighted:

Conclusion: the Bill relates to reserved matters. Holyrood cannot legislate for an independence referendum without Westminster’s consent.

SNP Arguments: Self‑Determination and Legality

The SNP argued Scotland had a right to self‑determination under international law and that refusing a referendum breached the principle of legality.

Supreme Court: rejected both.

Self‑determination applies only to:

• Former colonies
• Peoples under foreign military occupation
• Groups denied meaningful access to government

This follows Reference re Secession of Quebec.

The principle of legality was not breached because the Scotland Act provides a clear constitutional framework allocating powers between Scotland and the UK.

Commentary: Litigation as Political Theatre

The judgment was legally unsurprising. It confirmed the existing devolution settlement. But politically, it fits a pattern. The SNP has repeatedly used litigation to highlight constitutional constraints, including:

• The UNCRC incorporation Bill
• The Legal Continuity Bill during Brexit

By provoking disputes on emotive issues, the SNP seeks to galvanise support for independence. This judgment provides further ammunition by exposing the limits of devolved power.