Andy Burnham leads the Makerfield by-election market at 73.5% as the Labour candidate, reflecting his strong local profile as Greater Manchester mayor, prior representation of the area, and party machinery support following Josh Simons’s May 2026 resignation to create the vacancy. The contest on 18 June tests Labour’s hold on a longtime safe seat against Reform UK’s Robert Kenyon at 26.5%, whose campaign focuses on voter frustration with national issues including immigration and living costs. Recent polls indicate a narrower race than implied by trader pricing, with Kenyon drawing support in a constituency where Reform performed strongly in 2024. Minor candidates remain negligible. The outcome will also shape Labour’s internal leadership dynamics if Burnham wins and returns to Parliament.