Carlyle, the American investment giant, has become the latest global fund to weigh an investment in Thames Water as the stricken utility races to avoid being nationalised.

Sky News has learnt that Carlyle, which has roughly $435bn in assets under management, is at the very preliminary stages of assessing whether an investment in Thames Water Utilities Limited (TWUL) would be viable.

Britain’s biggest water and wastewater company, which has about 16 million customers, is edging towards the brink of collapse after warning in recent days that its financial liquidity is set to expire months earlier than previously anticipated.

It has also seen its credit rating downgraded further into junk territory by two leading rating agencies.

Carlyle is one of a long list of prospective investors approached by Rothschild, the investment bank advising Thames Water’s board, as the utility scrambles to raise more than £3bn in the coming months.

This weekend, people close to the process confirmed that Carlyle had been approached but said it was “too early” to judge whether the firm might participate in a rescue deal through one or more of its funds.

Among the others sounded out by Rothschild are Brookfield, the Canadian investment giant, and Global Infrastructure Partners, which is now owned by BlackRock.

Many investors and industry analysts believe, however, that the Rothschild-led process is destined to fail given the massive financial restructuring which faces Thames Water.

The company has about £16bn in debt, with approximately £10bn of that accounted for by a group of 90 funds which have appointed Jefferies and Akin Gump to represent them.

That syndicate is now preparing its own rescue plan in the coming weeks, which is likely to include an enormous debt-for-equity swap that would wipe out the existing shareholders.

Thames Water’s future remains so shrouded in uncertainty because the industry watchdog, Ofwat, has rejected the company’s initial spending plans for the next five-year regulatory period.

The company is now engaged in discussions with Ofwat ahead of its final determination in December.

A bridging loan of about £1bn is being contemplated by some of Thames Water’s creditors, but some stakeholders remain sceptical that any new financing will be forthcoming without greater regulatory certainty.

“Until the lenders know what they are bridging to, the concern deepens that they risk throwing good money after bad,” said one fund.

TWUL’s board is said to have met in the last 48 hours to discuss the implications of its latest rating downgrades and impending liquidity shortfall.

One creditor said that Ofwat was expected to appoint an independent monitor next week to scrutinise the company’s progress against its turnaround plan.

Ofwat, which signalled in August that it would make such an appointment, declined to comment.

If new investment into Thames Water is not forthcoming before it runs out of cash, the government will have little choice but to sanction the temporary nationalisation of the company.

This would be done through a Special Administration Regime (SAR), a procedure tested only once before when Bulb Energy collapsed in 2021.

As part of its contingency planning for implementing a far-reaching restructuring, Thames Water has booked court dates in November to progress a rescue deal.

A source close to the company said that Thames Water “continues to look at all options for extending its liquidity and raising new equity”.

“Reserving court dates is sensible forward planning and a part of keeping all options open.”

Canterbury MP Rosie Duffield has resigned from the Labour Party.

The 53-year-old MP is the first to jump ship since the general election and in her resignation letter criticised the prime minister for accepting thousands of pounds worth of gifts.

She told Sir Keir Starmer the reason for leaving now is “the programme of policies you seem determined to stick to”, despite their unpopularity with the electorate and MPs.

In her letter she accused the prime minister and his top team of “sleaze, nepotism and apparent avarice” which are “off the scale”.

“I’m so ashamed of what you and your inner circle have done to tarnish and humiliate our once proud party,” she said.

Sir Keir has faced backlash after a Sky News report revealed he had received substantially more freebies than any other MP since becoming Labour leader.

Since December 2019, the prime minister received £107,145 in gifts, benefits, and hospitality – a specific category in parliament’s register of MPs’ interests.

Ms Duffield, who has previously clashed with the prime minister on gender issues, attacked the government for pursuing “cruel and unnecessary” policies as she resigned the Labour whip.

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She criticised the decision to keep the two-child benefit cap and means-test the winter fuel payment, and accused the prime minister of “hypocrisy” over his acceptance of free gifts from donors.

“Since the change of government in July, the revelations of hypocrisy have been staggering and increasingly outrageous,” she said.

“I cannot put into words how angry I and my colleagues are at your total lack of understanding about how you have made us all appear.”

Ms Duffield also mentioned the recent “treatment of Diane Abbott”, who said she thought she had been barred from standing by Labour ahead of the general election, before Sir Keir said she would be allowed to defend her Hackney North and Stoke Newington seat for the party.

Her relationship with the Labour leadership has long been strained and her decision to quit the party comes after seven other Labour MPs were suspended for rebelling by voting for a motion calling for the two-child benefit cap to be abolished.

“Someone with far-above-average wealth choosing to keep the Conservatives’ two-child limit to benefit payments which entrenches children in poverty, while inexplicably accepting expensive personal gifts of designer suits and glasses costing more than most of those people can grasp – this is entirely undeserving of holding the title of Labour prime minister,” she said.

Ms Duffield said she will continue to represent her constituents as an independent MP, “guided by my core Labour values”.