A decade ago, as the final votes of the European Union referendum trickled in, the political consensus north of the border crystallized in a single phrase. "This changes everything," whispered figures across the political spectrum. The logic seemed ironclad. Scotland had voted overwhelmingly to remain in the EU by 62% to 38%. England had voted to leave. By dragging an unwilling nation out of the European single market, Westminster had supposedly handed the Scottish National Party (SNP) the ultimate, undeniable justification for a second independence referendum.
It did not happen.
Instead of triggering a runaway surge that broke the Union, Brexit locked Scottish politics into a permanent, grinding stalemate. A decade after the 2016 vote, support for independence remains stubbornly stuck where it has been for years, fluctuating between 48% and 52%. The structural reality of leaving the EU actually made the practical execution of Scottish independence significantly harder, creating a double-edged sword that the nationalist movement has failed to overcome. While the emotional argument for self-determination grew stronger, the economic and regulatory barriers to achieving it became immense.
The Trade Illusion and the Border Problem
The fatal flaw in the post-Brexit nationalist strategy was an inability to address the mechanics of trade. Before 2016, the SNP’s vision of an independent Scotland was predicated on a "seamless" transition where an independent state would exist comfortably within a shared European framework alongside the rest of the UK. Both nations would be part of the EU single market. Goods, services, and people would cross the Tweed without a second thought.
Brexit shattered that blueprint. When the UK government opted for a hard exit from the single market and the customs union, it fundamentally altered the geometry of the British Internal Market.
Suddenly, the SNP was forced to advocate for an independent Scotland rejoining the EU, which would mean establishing an official external EU border right across the island of Great Britain. Consider the raw numbers. Scotland’s trade with the rest of the UK is worth roughly three times its trade with all EU member states combined. By rejoining the EU while England remained outside, Scotland would be choosing to align its regulatory systems with Brussels rather than its biggest trading partner.
Nationalists tried to downplay this friction. They argued that technology or special arrangements could bypass the need for physical checks. But voters watched the chaos of the Northern Ireland Protocol and the implementation of the Windsor Framework. They saw the tangible, bureaucratic nightmare of veterinary checks, rules of origin certificates, and customs declarations. The abstract warning of a hard border became a visible reality, and the electorate grew deeply risk-averse.
Muscular Unionism and the Death of Devolved Consent
The friction was not confined to trade routes. It fundamentally altered how London governed.
For the first two decades of Holyrood’s existence, the UK government operated under a loose framework of mutual respect. Devolved competencies in agriculture, fisheries, and environmental policy were managed quietly because both London and Edinburgh were bound by overarching EU law.
Once Brussels was removed from the equation, Westminster adopted a philosophy of muscular unionism. The passing of the UK Internal Market Act 2020 was the turning point. This legislation effectively allowed Westminster to override decisions made by the Scottish Parliament if those decisions interfered with the smooth running of the UK-wide market.
- The Sewel Convention: This constitutional understanding dictates that Westminster will not normally legislate on devolved matters without Holyrood’s consent.
- The Post-Brexit Reality: Between 2018 and 2023, five major pieces of Brexit legislation were pushed through by London despite the explicit refusal of the Scottish Parliament to grant consent.
This aggressive centralization reached its peak when the UK Supreme Court ruled in 2022 that Holyrood could not hold an advisory independence referendum without Westminster's explicit permission. The legal avenues for a unilateral break were completely blocked.
The Irony of the Energy Transition
Nowhere is the paradox of post-Brexit Scotland clearer than in the northeast. The recent by-election victory for the Conservatives in Aberdeen South—a seat taken from the SNP following a massive swing—highlights how the constitutional debate has been overtaken by immediate economic anxiety.
The political argument shifted from constitutional theory to industrial survival. With the UK outside of European energy frameworks, domestic policy regarding the North Sea became a battleground. Nationalist strategists long relied on oil and gas revenues to underwrite the economics of a new state, later pivoting to the promise of a green energy boom. But the reality on the ground has been plagued by corporate ownership and external control.
Take the Whitelee wind farm just outside Glasgow. It is the largest onshore facility of its kind in the UK, yet it is owned by a foreign multinational. The components were manufactured abroad, and the profits flow out of the country into a privatized grid. For the average voter facing high domestic energy bills, the promise of Scotland's vast natural wealth under independence began to ring hollow when contrasted with the immediate reality of post-Brexit inflation and the cost-of-living squeeze.
The Stalemate of the Two Unions
The nationalist movement found itself trapped by the very argument it used to build its base. By framing the campaign around rejoining the European Union, the SNP alienated a quiet but significant segment of its own support.
Approximately one-third of SNP voters in 2016 actually voted to leave the EU. For these voters, independence was about localized sovereignty, not trading a union with London for a union with Brussels. When the party platform became explicitly and uncompromisingly europhile, these voters began to drift away, offsetting the gains made among middle-class, pro-Remain unionists who were horrified by Brexit but equally terrified of further economic disruption.
The UK government, meanwhile, learned that it did not need to win the intellectual argument for the Union; it simply needed to emphasize the sheer complexity of dismantling it.
We are left with a political landscape that is deeply polarized but completely frozen. Brexit did not destroy the case for the Union, nor did it guarantee the collapse of the UK. It simply raised the stakes, making the price of admission for an independent nation far higher than anyone was willing to admit a decade ago. The status quo remains broken, but the alternative now carries a warning label that no political campaign has been able to rewrite.
