Thames Water has suffered a major blow in its attempt to secure its future after US private equity giant KKR pulled out of a £4bn rescue deal for the company.
The setback increases the possibility that the UK's biggest water company will collapse into a government-supervised administration.
Thames Water called the news "disappointing" but said it would proceed to work on an alternative plan, which is considered the last chance to save the company from administration.
Environment Secretary Steve Reed said the government was "carefully monitoring the situation".