Douglas Lumsden took Aberdeen South for the Scottish Conservatives on 19 June, overturning an SNP hold with a majority of more than 6,000 votes — the party's first Westminster by-election gain in Scotland in over half a century, according to The Telegraph.

The same night brought a countervailing result further up the east coast. Lara Bird, a barrister standing as a part-time candidate, held Arbroath and Broughty Ferry for the SNP, according to The National. Two contests, two different parties — Scotland's electoral map offered something for every strategist to work with.

Aberdeen South: The Weight of the Margin

A majority of over 6,000 in a Westminster by-election is not a squeaky gain. Aberdeen South had been SNP-held territory, and a swing of that magnitude in a single-seat contest points to a significant collapse in the nationalist vote share rather than a modest drift. Whether that reflects disillusionment with the SNP's record in government at Holyrood, anxiety about the North Sea energy transition among Aberdeen's oil-and-gas workforce, or simple mid-term volatility in a seat the SNP never held with deep roots is, for now, a matter of interpretation.

What is not in doubt is the historical weight of the result for the Scottish Conservatives. Their last Westminster by-election win in Scotland predates devolution by decades — a span that covers the creation of the Scottish Parliament in 1999, three referendums, and a near-complete collapse of Scottish Conservative representation at Westminster during the Blair years. Lumsden's win does not reverse all of that history, but it provides a data point the party will cite heavily ahead of the 2026 Holyrood elections.

Aberdeen South sits within the north-east of Scotland, a region with a distinct economic identity built around energy, fishing and agriculture. It is, politically, one of the more contested stretches of Scottish electoral geography — it has returned Conservative, Labour and SNP MPs at different points — so a Conservative gain here carries more plausibility than it would, say, in central Glasgow. That context does not diminish the result; it contextualises it.

Arbroath and Broughty Ferry: The SNP Holds Its Ground

The SNP's retention of Arbroath and Broughty Ferry — a seat covering Angus and parts of the Dundee periphery — matters in the same breath as Aberdeen South precisely because it prevents the night from being read as a unidirectional nationalist collapse. Bird's win on the same evening gives the SNP a clean counter-narrative.

Bird's profile is worth noting. A practising barrister standing on a part-time basis, she is not a career politician in the traditional mould. The SNP has increasingly drawn on professional candidates with external credibility in by-elections; whether that is a strategic positioning choice or a reflection of the party's candidate pool at Westminster level is a question the membership tends not to discuss publicly.

The Arbroath seat encompasses some of the most dependable SNP territory in Scotland — Angus and Dundee-adjacent constituencies have returned nationalist MSPs and MPs with consistency since the 2010s. A hold here was expected. It was delivered.

What the Night Adds Up To

Taken together, the two results reinforce that Scottish politics remains genuinely competitive across different geographies, and that no single party currently commands a sweep. The Conservatives gain one seat; the SNP hold one. Labour, whose Scottish operation has been gradually rebuilding since 2024, were not the story on 19 June.

For the Scottish Conservatives, the Aberdeen South result will be used to argue that a revival at Holyrood — where elections are due — is credible rather than aspirational. Lumsden's majority gives the argument a concrete foundation. For the SNP, Bird's win is a reminder that their coalition, while under pressure in the north-east, remains intact across their heartland seats.

The by-elections were conducted under Westminster rules and apply to the UK Parliament — both seats are devolved in the sense that their constituents are represented separately at Holyrood, where the Scottish Parliament holds legislative competence over health, education and justice, among other areas.