Scottish Conservatives Win Aberdeen Seat in First By-Election Victory

Douglas Lumsden won the Aberdeen South seat for the Scottish Conservatives on 18 June 2026. This was the party's first by-election win in Scotland in recent memory, and its first gain anywhere since the 2024 general election.

The contest happened because the previous MP resigned. When an MP chooses to leave, it can change how voters behave — they may be less loyal to the party that just lost its representative. In Aberdeen South, the Scottish Conservatives beat Labour, the SNP and other candidates in what had been a Labour seat. BBC News confirmed the result.

A by-election win matters differently to a party than holding a seat in a general election. By-elections get lots of attention and resources go into a single constituency. Winning one is a particular kind of achievement.

For the Scottish Conservatives, this result has real meaning. The party was left with just one Westminster MP after 2024. Aberdeen South is not just extra numbers — it shows the party can still win elections in Scotland. Whether this win reflects something that will last, or just the unusual dynamics of a mid-term contest with fewer voters turning out, the next general election will tell us more clearly.

The timing is worth noting. The SNP holds several seats in Scotland with very small majorities. Stephen Gethins, who holds Arbroath and Broughty Ferry, won by just 859 votes at the 2024 election — a margin of 1.9% per the official election returns. A Conservative by-election win in Scotland, wherever exactly it comes from, will worry SNP MPs who hold their seats by similarly thin margins.

Labour will also think carefully about this result. The party performed well in Scotland in 2024 and expects to compete seriously for Westminster seats north of the border. A Conservative win in a seat Labour thought it could contest strongly is not welcome news.

One constituency does not settle the bigger questions about Scottish politics. Elections to Westminster, the Scottish Parliament (Holyrood) and local councils all happen on different timelines and rarely send clean signals. But for a Scottish Conservative party working to rebuild its presence at Westminster, this is the kind of result that helps.