Andy Burnham's pursuit of a return to Westminster has intensified following Labour MP Josh Simons's resignation to clear a path for him in the Makerfield by-election, with the party's National Executive Committee granting permission to seek selection. This development positions Burnham as a potential challenger to Keir Starmer's leadership, but the timeline for any mayoral vacancy remains extended. Local government rules prevent holding both the Greater Manchester mayoralty and a parliamentary seat simultaneously due to policing responsibilities, yet no resignation has been announced, and the by-election process—including candidate selection and polling—extends well beyond May 31. Traders assign a 91.5% implied probability to "No," reflecting the absence of any immediate catalyst for departure and historical patterns where such transitions unfold over months rather than weeks.