Singer, whom Bloomberg has called "the most feared investor in the world," famously once ordered the impounding of an Argentinian navy ship after the country failed to pay its debts. His firm's average annual returns of 14 per cent suggest he expects substantial profits from Thames.

Cat Hobbs of campaign group We Own It said: "Trump wants control over NHS drug prices, and his mega donor Singer wants control over our water. 'Absolutely not' should be the answer of any government that considers itself patriotic."

The deal is reportedly being handled by Singer's son Gordon Singer, who runs Elliott's London office. In 2024, Gordon attempted to donate nearly £2,000 to Robert Jenrick's failed Conservative leadership bid, though the money was returned as "impermissible" by the Electoral Commission.

For Labour, the Thames situation presents an uncomfortable choice between ideological opposition to bailouts for failed privatisation and practical concerns about service continuity. The party has historically supported bringing water back into public ownership, but Keir Starmer's government appears wary of the immediate costs and disruption.

Critics argue any deal allowing Thames to escape fines and environmental standards would reward decades of mismanagement whilst passing costs to consumers. The creditors' £3 billion loan already commits customers to paying interest rates nearly double typical government borrowing costs.

This represents Labour's first major test on whether it will hold the line on privatisation failures or cave to investor pressure. The precedent set here will echo through future utility crises, from energy companies to rail operators. Parliamentary sources suggest backbench Labour MPs are watching closely, particularly those representing constituencies affected by Thames Water's chronic sewage spills and infrastructure failures.

The question facing ministers is whether Britain's largest water company is too big to fail—or whether allowing collapse might finally break the model of privatised utilities that prioritise shareholder returns over public service.