With the Scottish government gearing up for a second independence referendum, questions have been raised about whether or not the Scottish Parliament can legislate for such a poll in a way that the courts will find lawful. In this post, David Torrance discusses the wording of the relevant legislation and the impact of subsequent caselaw, concluding that the prevailing legal understanding is that even a consultative referendum would be outside the scope of the parliament’s powers.

During the House of Lords’ consideration of what would become the Scotland Act 1998, Lord (Donald) Mackay of Drumadoon (a former Lord Advocate and subsequently a Scottish judge) told peers it would be ‘perfectly possible to construct a respectable legal argument’ that it was within the legislative competence of the soon-to-be-created Scottish Parliament to pass a bill authorising an independence referendum.

Lord Mackay added that he remained ‘convinced that the law on this matter should be clarified. If it is not then the festering issue as to whether the Scottish parliament is competent to hold such a referendum will rumble on.’ That was arguably a dictionary definition of prescience.

The debate, if not ‘festering’ does indeed ‘rumble on’ nearly a quarter of a century later, yet much of the commentary seems curiously circular, turning over arguments which might have been relevant in 1998 or 2012 but are less so in 2022. Chief among these is the idea that an ‘advisory’ or ‘consultative’ referendum might pass muster if the dispute were to reach the Supreme Court.

But first let us return to the Lords in 1998. Speaking for the government, Lords Sewel and Hardie (respectively a Scottish Office minister and the then Lord Advocate) were clear that an independence referendum bill would ‘relate to’ the reserved matter of the Union between Scotland and England and would therefore be ultra vires and outside the competence of the Scottish Parliament. As Lord (David) Hope of Craighead later observed, ‘the Scotland Act provides its own dictionary’.