Fears about the company go beyond its precarious financial position and include the management of sites that provide drinking water and sewage treatment for millions of customers across the capital and the Thames valley.
Keir Starmer and Rachel Reeves were first to be briefed on the issue.
They were warned by civil servants that the dire state of Thames's infrastructure is one of the most urgent problems facing the new government, according to sources.
The condition of Coppermills, a vast water treatment works in north-east London that serves as many as 3 million people, is particularly alarming, ministers and aides have been told. The site is classed among the UK's most important pieces of national infrastructure.
A financial update today is due to reveal more about the frayed finances of Britain's biggest water company.
Thames's annual results will be followed on Thursday by an initial verdict from the watchdog Ofwat on water companies' five-year spending plans and bill increases.
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Denne historien er fra July 09, 2024-utgaven av The Guardian.
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Parry: Premier League would be 'sterile' without EFL
Rick Parry has accused the Premier League of undervaluing the football pyramid, arguing that without the \"variety and competition\" that come from relegation and promotion the game would become \"sterile\".
Official review: Coote faces FA investigation as Webb breaks silence on video
The Football Association has launched its own investigation into the behaviour of the referee David Coote after remarks he made about Jürgen Klopp in a video that surfaced online this week.
Match-by-match: Coote's Liverpool games as an official
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Is it really a surprise that an official or someone similar should end up glassy-eyed and spitting toxins on a sofa?
Hall's audition adds intrigue to England's Nations League finale
In-form Newcastle defender can show Thomas Tuchel he can be the solution to perennial problem on the left
'It's about robust planning, proper financial control'
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The super-lightweight world champion Katie Taylor says her rematch against Amanda Serrano in Texas, as the main support act to Tyson v Paul, will be something special
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Manchester City maintained their 100% start in the Women's Champions League group stage as second-half goals from youngsters Laura Blindkilde Brown and Aoba Fujino were enough to beat a determined Hammarby side.
Players must cope with extra scrutiny, says Lewis
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No input from Jones in England's plan to upset Springboks
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