The provided articles are opinion pieces from the Daily Mail that connect projected outcomes in a by-election to the future direction of British politics. They state that polling indicates Andy Burnham could win the Makerfield by-election, and they use that as a basis for arguing that moves to challenge or remove Sir Keir Starmer as prime minister would begin “in earnest.” The commentary frames the prospective leadership challenge as coming from what it describes as a “hard-Left” faction, but it does not offer additional evidence or specific actions beyond the claim that political pressure would increase following the by-election. Across the sources, the core assertions remain the same: polls are described as predicting a Burnham win in Makerfield, and that result is portrayed as a trigger for an intensified attempt to replace Starmer. No other outlets’ reporting, voting results, or independent verification are included in the text provided, so the account relies solely on the opinion writers’ interpretation of polling and party dynamics.