Andy Burnham leads the Makerfield by-election market at 82% due to his fast-tracked selection as the Labour candidate after the May 2026 resignation of incumbent Josh Simons, which explicitly created the opportunity for the Greater Manchester mayor and former cabinet minister to return to Westminster. Labour’s National Executive Committee bypassed local selection processes to confirm him in mid-May, leveraging his strong regional profile and the constituency’s history as a safe Labour seat. Reform UK’s Robert Kenyon, a local candidate who previously contested the seat, holds the next position at 16% by focusing on cost-of-living issues, though he lacks equivalent party infrastructure or name recognition ahead of the June 18 vote. Minor candidates trail at low single digits or below, reflecting limited competitive traction in the short campaign window.