By Fraser McMillan and Davide Vampa
In October 1967, a political earthquake struck the Scottish town of Hamilton. The Scottish National Party, until then a marginal force, surged to prominence when Winnie Ewing captured a Westminster seat long held by Labour. That by-election was transformative, marking the start of the SNP’s ascent into mainstream politics – a journey that would ultimately result in devolution, nationalist government, and a close-fought referendum on independence.
Nearly sixty years later, Hamilton has once again become the stage for political disruption. The 2025 Scottish Parliament by-election in Hamilton, Larkhall and Stonehouse – triggered by the death of SNP MSP Christina McKelvie – may prove another symbolic turning point. But this time, it is not the SNP that is making history. Nor is it a straightforward story of Labour revival. The real surprise has been the unprecedented rise of Reform UK, a party that until now had no electoral footprint in Scotland.
A brittle comeback, a significant decline, and a populist surge
The headline result was a Labour victory – the party won with 32% of the vote. This came as a surprise to many given the surrounding media narrative, but it was far from a commanding performance. In fact, the party’s share fell by two points compared to the 2021 Holyrood election, when it was struggling nationally (finishing third across Scotland, behind the Conservatives). However, the one-off nature of the contest and Labour’s large intake of new Scottish MPs following its general election victory last year allowed it to deploy a stronger ground operation, which limited losses and enabled it to finish first. That said, the resilience of the Labour vote even in the shadow of an unpopular UK Labour administration suggests that we will see three-way contests like this springing up all over Scotland next May. The morale boost provided by winning the seat will also allow the party to approach that contest with optimism rather than the doom and gloom that has seemed a fixture since Keir Starmer entered Downing Street last July.
In contrast, the SNP – expected to retain the seat, albeit with a reduced majority – suffered losses largely corresponding to their defeat in that 2024 general election, plunging from 46% to 29%. The party’s polling has stabilised but not risen, and the 29% in this constituency is not far from its national numbers. The even spread of SNP support around the country hurt the party last year, and they will now fear a repeat in 2026, albeit one muted by the proportional electoral system. Labour hope to focus minds on the nationalists’ record in government and make the next Holyrood election about change north of the border, and this result suggests that is their best hope of dislodging John Swinney.
The most notable takeaway from this by-election, however, came from Reform UK, which surged from essentially zero support to 26% – narrowly missing second place but outperforming expectations, including Britain Predicts’ estimate of 23%. Such a result would have been considered a triumph even in an English constituency last year. The fact that it was met with disappointment by some Farage supporters, who had hoped the party would take second or even win, only underscores how dramatic its rise in the Scottish context is. Meanwhile, the Conservatives endured a brutal collapse, falling from 18% to just 6%, and effectively exiting the contest – with Reform not only cannibalising Tory voters but attracting further support.
The scale and asymmetry of these shifts point to a profound political realignment. Labour’s surprise win – driven largely by the SNP’s collapse – was underwhelming in its own right and reveals the absence of a single, dominant beneficiary from the nationalist party’s decline. Instead, Scottish politics appears to be entering a far more fragmented and volatile phase – one in which old certainties are rapidly eroding.
Is this the end of constitutional polarisation?
The defining feature of Scottish politics since the 2014 independence referendum has been structured constitutional polarisation: a mutually reinforcing division between pro- and anti-independence blocs, embodied respectively by the SNP and the Conservatives. This dynamic persisted through the 2021 Scottish election. But the Hamilton by-election reinforces the result of the 2024 general election in demonstrating that this is now a thing of the past.
The SNP’s strategy under John Swinney to elevate Reform UK as its principal opponent – in an effort to create a new form of polarisation – appears to have backfired. Rather than consolidating progressive support, it may have inadvertently legitimised Reform and amplified its appeal among disillusioned voters. Unlike the ‘symbiotic’ SNP-Tory binary of the past, there is currently no clear bulwark against Reform. Labour’s ambiguous positioning, coupled with the Conservatives’ continued decline, leaves the populist right-wing party facing little coordinated resistance.
The result is not the emergence of a new structured polarisation, but its opposite: political flux. If the constitutional question once offered a kind of order to Scottish politics – however contentious – today’s landscape is marked by volatility and fragmentation.
The Reform disruption and its vulnerabilities
Reform UK’s breakthrough, even in defeat, is disruptive. It upended assumptions about the impermeability of Scottish politics to Farage-style populism. The timing was also dramatic: on the day of the by-election, Reform’s chairman Zia Yusuf resigned – a reminder of the party’s internal instability. Leadership crises are not uncommon among populist radical right parties, though they often only temporarily halt their rise. This pattern has been seen elsewhere in Europe. In Germany, for example, AfD’s co-leader Frauke Petry quit shortly after the party’s 2017 breakthrough, when it won nearly 13% of the vote. The departure barely dented AfD’s momentum; by 2025, it had become the country’s second-largest party, with over 20% support.
Whether Reform’s rise in Hamilton is a one-off or the start of a long-term presence at Holyrood remains uncertain. But what is clear is that it taps into deeper discontents – not just with the SNP or Holyrood, but with the entire political establishment. The SNP, after nearly two decades in power, increasingly resembles the status quo it once opposed. Reform’s anti-establishment message, even if simplistic, may resonate in this context. By positioning Reform as its principal opponent, the SNP risks legitimising Farage’s party further – and, in doing so, may inadvertently cast itself as the main target of anti-establishment mobilisation. On the other hand, pro-independence Scots are almost uniformly left of centre and pro-EU and will therefore expect the party to take the fight to the radical right.
Unlike the SNP’s rise, which was anchored in constitutional identity and aspirations for national self-determination, Reform’s appeal is driven by cultural grievance and rejection of the political class. Its core themes – opposition to immigration, net zero, and socially progressive ‘woke’ politics – reflect a style of politics that, until recently, seemed to resonate primarily with voters in England and Wales. The fact that such a message could gain traction in Scotland – even in a one-off by-election – signals a potential shift in the political terrain.
Still, there are significant obstacles to Reform’s longer-term viability north of the border. Nigel Farage remains deeply unpopular among large segments of the Scottish public, particularly among the pro-independence, pro-EU, and socially progressive voters who make up nearly half of the electorate. This suggests that the party may face a low electoral ceiling, despite its sudden surge. Comparative experiences offer a mixed picture: for example, Italy’s Northern League was able to rebrand and expand significantly into previously hostile territory – even in southern regions where the party had long been despised and virtually absent. Yet this success was short-lived and brought with it internal tensions and the risk of alienating core constituencies.
For Reform UK to move from symbolic success to a sustained presence in Scotland, it will need more than provocative messaging. It will require organisational depth, a credible local infrastructure, and the ability to adapt its rhetoric to a Scottish context. So far, those elements appear lacking. The party’s operations have been erratic, and its campaign – including a controversial advert targeting Anas Sarwar’s Pakistani heritage – drew widespread criticism. The resignation of Yusuf further underscores Reform’s organisational fragility, even at the UK level.
Conclusion: A system without anchors?
While the Hamilton result marks a powerful moment of disruption, it remains unclear whether this will translate into longer-term traction. What it does confirm, however, is that Scottish politics – once seen as unusually structured and stable – is entering an era of growing volatility, where insurgents like Reform can no longer be dismissed out of hand.
The SNP’s attempt to shift from a constitutional to a socio-cultural, progressive-versus-reactionary confrontation has stumbled. Labour’s hoped-for resurgence appears more brittle than assured. Reform UK, while organisationally unstable, has become the wildcard – a disruptive actor in a system that no longer has clear structuring poles.
This fragmentation carries risks. Without structured polarisation, Scottish politics may slide into unstructured volatility. A disruptive polariser like Reform UK could reshape the system without facing a coherent counterforce. In such a scenario, the rules of the political game are not just changing – they may be dissolving altogether.