Andy Burnham formally launches his by-election campaign by arguing that current council tax is “regressive” and should be overhauled, according to the reporting. The coverage frames his position as part of a Labour shift to the left, while his central proposal is to reform how council tax works so that the system does not place greater burdens on lower-income households. The article warns that millions of families could see changes to their bills under any council tax restructuring, implying potential increases or major impacts depending on the design of the reform. The reporting does not provide detailed policy mechanisms or timelines in the supplied material, focusing instead on Burnham’s criticism of council tax and his decision to make council tax reform a key campaign theme. Overall, the sources present Burnham as campaigning on council tax change, emphasizing the argument that the existing approach is unfair, without offering extensive specifics in the excerpt.