Reference by the Lord Advocate of devolution issues under Schedule 6 to the Scotland Act 1998 [2022] UKSC 31

The Scottish Government proposed a bill for a referendum asking whether Scotland should be an independent country. The proposed vote was described as advisory and would not itself alter the law or automatically end the Union. Before introducing the bill, the Lord Advocate referred to the Supreme Court whether its provision would fall within the Scottish Parliament's legislative competence. The Scotland Act 1998 reserves matters relating to the Union of the Kingdoms of Scotland and England and the Parliament of the United Kingdom. The Lord Advocate argued that an advisory referendum had no direct legal consequences and therefore did not relate sufficiently to those reserved matters.

Would legislation for an advisory Scottish independence referendum relate to the reserved matters of the Union and the UK Parliament, placing it outside the Scottish Parliament's competence?

The Supreme Court unanimously held that the proposed provision would be outside devolved competence. Its purpose and effect had more than a loose or consequential connection with the Union and the sovereignty of the UK Parliament. Even without automatic legal force, a lawful referendum would be a major political event intended to ascertain and demonstrate democratic support for ending the Union. That practical effect was relevant under the Scotland Act. The court also rejected reliance on the international principle of self-determination: Scotland was not a colony or an oppressed people denied meaningful access to government, and international law did not displace the domestic allocation of legislative power. A section 30 order could alter competence by political agreement.

A Scottish Parliament provision is outside competence if, considering its purpose and effect, it relates more than consequentially to a reserved matter. An advisory referendum on independence relates directly to the Union and the sovereignty of the UK Parliament despite lacking automatic legal consequences.

The reference is the authoritative statement that Holyrood cannot unilaterally legislate for an independence referendum under the current Scotland Act settlement. It demonstrates that legislative “effect” includes practical and political consequences, not only immediate changes to legal rights. The decision does not decide whether Scotland should become independent, nor does it prevent a referendum authorised through a Westminster section 30 order. It should be read with AXA General Insurance Ltd v Lord Advocate on the constitutional status of devolved institutions and Miller on statutory constitutional change.