Recent resignations by high-profile MPs, including former Prime Minister Keir Starmer in Holborn and St Pancras and Reform UK leader Nigel Farage in Clacton, have driven six parliamentary by-elections in 2026 through October, with no additional contests currently scheduled before year-end. Trader consensus favoring six or seven total outcomes reflects the typical pace of vacancies from retirements, party switches, or personal circumstances in a post-2024 parliament, alongside the absence of confirmed polling dates and limited remaining calendar time. Historical patterns of one to three further by-elections in similar late-year periods support the narrow spread between the leading probabilities, while the low odds on eight or more account for the low likelihood of multiple unexpected triggers in the final weeks.