Recent resignations have driven the timing of UK parliamentary by-elections, with writs moved by party whips typically leading to polls 21–27 working days later. As of early October 2026, the Holborn and St Pancras contest—triggered by former Prime Minister Keir Starmer’s September resignation to focus on international affairs—is scheduled for 8 October, following the formal writ process. Prior vacancies produced by-elections in Clacton (August), Makerfield and Scottish seats (June), and others earlier in the parliament, often linked to health issues, dual mandates, or party controversies. Local council by-elections continue on various dates through October and November, but Westminster timing remains flexible and dependent on future MP departures or procedural motions. Traders monitor announcements from the Speaker’s office and party whips for the next writ.