Andy Burnham's potential ascension to the role of Prime Minister presents a complex challenge, particularly regarding the management of Thames Water. The company's impending financial crisis, exacerbated by the government's rejection of a private sector rescue deal, could force Burnham into a decision that tests his commitment to public ownership. The article highlights the dilemma: while Burnham advocates for public control of utilities, the financial implications of nationalizing Thames Water are substantial, estimated at £100 billion for the entire country. This raises questions about the feasibility of such a move, especially considering the potential backlash from bond markets and the public. The author speculates that Burnham's first major test as Prime Minister might be navigating this crisis, and the article concludes by emphasizing the uncertainty surrounding Burnham's approach to this critical issue.