A power outage that shut Heathrow Airport earlier this year, causing travel chaos for more than 270,000 passengers, was caused by a “catastrophic failure” of equipment in a nearby substation, according to a new report.
Experts say the fire at the North Hyde Substation, which supplies electricity to Heathrow, started following the failure of a high-voltage electrical insulator known as a bushing, before spreading.
The failure was “most likely” caused by moisture entering the equipment, according to the report.
Image: The fire at Hayes electrical substation, which led to Heathrow Airport shutting down in March. Pic: @JoselynEMuirhe1/PA
National Grid, which owns the substation, missed two opportunities to prevent the failure, experts found, the first in 2018 when a higher-than-expected level of moisture was found in oil samples.
Such a reading meant “an imminent fault and that the bushing should be replaced”, according to guidance by the National Grid Electricity Transmission.
However, the report by National Energy System Operator (NESO) said the appropriate responses to such a serious issue were “not actioned”, including in 2022 when basic maintenance was postponed.
“The issue therefore went unaddressed,” the report added.
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Moment Heathrow substation ignites
The design and configuration of the airport’s internal power network meant the loss of just one of its three supply points would “result in the loss of power to operationally critical systems, leading to a suspension of operations for a significant period”, the report added.
Heathrow – which is Europe’s biggest airport – closed for around 16 hours on 21 March following thefire, before reopening at about 6pm.
Image: The North Hyde electrical substation which caught fire. File pic: PA
Tens of millions of pounds were lost, thousands of passengers were stranded, and questions were raised about the resilience of the UK’s infrastructure.
More than 71,000 domestic and commercial customers lost power as a result of the fire and the resulting power outage, the report said.
NESO chief executive, Fintan Slye, said there “wasn’t the control within their [National Grid’s] asset management systems that identified that this [elevated moisture levels] got missed.
“They identified a fault, [but] for some reason the transformer didn’t immediately get pulled out of service and get repaired.
Image: Smoke rises following the fire
“There was no control within the system that looked back and said ‘oh, hang on a second, you forgot to do this thing over here’.”
Sky’s science and technology editor, Tom Clarke, pointed to the age of the substation’s equipment, saying “some of these things are getting really very old now, coming to the end of their natural lives, and this is an illustration of what can happen if they are not really well maintained”.
The report also highlights a lack of joined-up thinking, he said, as “grid operators don’t know who’s critical national infrastructure on the network, and they don’t have priority”.
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Heathrow bosses were ‘warned about substation’
Responding to the report’s findings, a Heathrow spokesperson said: “A combination of outdated regulation, inadequate safety mechanisms, and National Grid’s failure to maintain its infrastructure led to this catastrophic power outage.
“We expect National Grid to be carefully considering what steps they can take to ensure this isn’t repeated.
“Our own Review, led by former Cabinet Minister Ruth Kelly, identified key areas for improvement and work is already underway to implement all 28 recommendations.”
In May, Ms Kelly’s investigation revealed that the airport’s chief executive couldn’t be contacted as the crisis unfolded because his phone was on silent.
Image: Stranded passengers at Heathrow Terminal 5 following the fire
Pic: PA
Energy Secretary Ed Miliband, who commissioned the NESO report, called it “deeply concerning”, because “known risks were not addressed by the National Grid Electricity Transmission”.
Mr Miliband said energy regulator Ofgem, which opened an investigation on Wednesday after the report was published, is investigating “possible licence breaches relating to the development and maintenance of its electricity system at North Hyde.
“There are wider lessons to be learned from this incident. My department, working across government, will urgently consider the findings and recommendations set out by NESO and publish a response to the report in due course.”
National Grid said in a statement it has “a comprehensive asset inspection and maintenance programme in place” and said it has “taken further action since the fire”.
This includes “an end-to-end review” of its oil sampling process and results, further enhancement of fire risk assessments at all operational sites, and “re-testing the resilience of substations that serve strategic infrastructure”.
A spokesperson said: “We fully support the recommendations in the report and are committed to working with NESO and others to implement them. We will also cooperate closely with Ofgem’s investigation.
“There are important lessons to be learnt about cross sector resilience and the need for increased coordination, and we look forward to working with government, regulators and industry partners to take these recommendations forward.”
The Coca-Cola Company is brewing up a sale of Costa, Britain’s biggest high street coffee chain, more than six years after acquiring the business in a move aimed at helping it reduce its reliance on sugary soft drinks.
Sky News can exclusively reveal that Coca-Cola is working with bankers to hold exploratory talks about a sale of Costa.
Initial talks have already been held with a small number of potential bidders, including private equity firms, City sources said on Saturday.
Lazard, the investment bank, is understood to have been engaged by Coca-Cola to review options for the business and gauge interest from prospective buyers.
Indicative offers are said to be due in the early part of the autumn, although one source cautioned that Coca-Cola could yet decide not to proceed with a sale.
Costa trades from more than 2,000 stores in the UK, and well over 3,000 globally, according to the latest available figures.
It has been reported to have a global workforce numbering 35,000, although Coca-Cola did not respond to several attempts to establish the precise number of outlets currently in operation, or its employee numbers.
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This weekend, analysts said that a sale could crystallise a multibillion pound loss on the £3.9bn sum Coca-Cola agreed to pay to buy Costa from Whitbread, the London-listed owner of the Premier Inn hotel chain, in 2018.
One suggested that Costa might now command a price tag of just £2bn in a sale process.
The disposal proceeds would, in any case, not be material to the Atlanta-based company, which had a market capitalisation at Friday’s closing share price of $304.2bn (£224.9bn).
At the time of the acquisition, Coca-Cola’s chief executive, James Quincey, said: “Costa gives Coca-Cola new capabilities and expertise in coffee, and our system can create opportunities to grow the Costa brand worldwide.
“Hot beverages is one of the few segments of the total beverage landscape where Coca-Cola does not have a global brand.
“Costa gives us access to this market with a strong coffee platform.”
However, accounts filed at Companies House for Costa show that in 2023 – the last year for which standalone results are available – the coffee chain recorded revenues of £1.22bn.
While this represented a 9% increase on the previous year, it was below the £1.3bn recorded in 2018, the final year before Coca-Cola took control of the business.
Coca-Cola has been grappling with the weak performance of Costa for some time, with Mr Quincey saying on an earnings call last month: “We’re in the mode of reflecting on what we’ve learned, thinking about how we might want to find new avenues to grow in the coffee category while continuing to run the Costa business successfully.”
“It’s still a lot of money we put down, and we wanted that money to work as hard as possible.”
Costa’s 2022 accounts referred to the financial pressures it faced from “the economic environment and inflationary pressures”, resulting in it launching “a restructuring programme to address the scale of overheads and invest for growth”.
Filings show that despite its lacklustre performance, Costa has paid more than £250m in dividends to its owner since the acquisition.
The deal was intended to provide Coca-Cola with a global platform in a growing area of the beverages market.
Costa trades in dozens of countries, including India, Japan, Mexico and Poland, and operates a network of thousands of coffee vending machines internationally under the Costa Express brand.
The chain was founded in 1971 by Italian brothers Sergio and Bruno Costa.
It was sold to Whitbread for £19m in 1995, when it traded from fewer than 40 stores.
The business is now one of Britain’s biggest private sector employers, and has become a ubiquitous presence on high streets across the country.
Its main rivals include Starbucks, Caffe Nero and Pret a Manger – the last of which is being prepared for a stake sale and possible public market flotation.
It has also faced growing competition from more upmarket chains such as Gail’s, the bakeries group, which has also been exploring a sale.
Coca-Cola communications executives in the US and UK did not respond to a series of emails and calls from Sky News seeking comment on its plans for Costa.
TikTok is putting hundreds of jobs at risk in the UK, as it turns to artificial intelligence to assess problematic content.
The video-sharing app said a global restructuring is taking place that means it is “concentrating operations in fewer locations”.
Layoffs are set to affect those working in its trust and safety departments, who focus on content moderation.
Unions have reacted angrily to the move – and claim “it will put TikTok’s millions of British users at risk”.
Figures from the tech giant, obtained by Sky News, suggest more than 85% of the videos removed for violating its community guidelines are now flagged by automated tools.
Meanwhile, it is claimed 99% of problematic content is proactively removed before being reported by users.
Executives also argue that AI systems can help reduce the amount of distressing content that moderation teams are exposed to – with the number of graphic videos viewed by staff falling 60% since this technology was implemented.
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It comes weeks after the Online Safety Act came into force, which means social networks can face huge fines if they fail to stop the spread of harmful material.
The Communication Workers Union has claimed the redundancy announcement “looks likely to be a significant reduction of the platform’s vital moderation teams”.
In a statement, it warned: “Alongside concerns ranging from workplace stress to a lack of clarity over questions such as pay scales and office attendance policy, workers have also raised concerns over the quality of AI in content moderation, believing such ‘alternatives’ to human work to be too vulnerable and ineffective to maintain TikTok user safety.”
John Chadfield, the union’s national officer for tech, said many of its members believe the AI alternatives being used are “hastily developed and immature”.
He also alleged that the layoffs come a week before staff were due to vote on union recognition.
“That TikTok management have announced these cuts just as the company’s workers are about to vote on having their union recognised stinks of union-busting and putting corporate greed over the safety of workers and the public,” he added.
Under the proposed plans, affected employees would see their roles reallocated elsewhere in Europe or handled by third-party providers, with a smaller number of trust and safety roles remaining on British soil.
The tech giant currently employs more than 2,500 people in the UK, and is due to open a new office in central London next year
A TikTok spokesperson said: “We are continuing a reorganisation that we started last year to strengthen our global operating model for Trust and Safety, which includes concentrating our operations in fewer locations globally to ensure that we maximize effectiveness and speed as we evolve this critical function for the company with the benefit of technological advancements.”
The government has stressed it will cover staff wages and the running costs of the plants until a buyer is found.
Image: The Liberty Steel plant in Rotherham
Speaking to Sky’s Anna Jones, Community Union National Secretary Alun Davies said workers are “concerned” about the developments.
He added: “Today is payday – but because the bank accounts were closed, I think the special managers and the HR team now are working with the unions to get that pay in today or as soon as they can.”
With a bank holiday weekend fast approaching, workers may only receive their wages on Tuesday unless payments are made as a matter of urgency.
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Mr Davies said he is confident that the plants have a future, telling Sky News: “If we use British-made steel for British infrastructure projects, it creates jobs, it grows economies and it gets our economy back on track, which is what this Labour government is trying to do.”
While he said government investment is valuable, the union official cautioned: “If we can find a decent buyer – a reputable steel company that knows what they’re doing – we’re open to all options.
“We’re not going to just say nationalise or part-nationalise, it’s what’s best for the business and gets the business up and running as soon as possible … if the government takes ownership, that is a significant cost to the taxpayer.”
Image: Alun Davies
Mr Davies explained that many workers have been staying at home and on 85% pay, which is having a big impact on their mental health and wellbeing.
In a statement, Community’s General Secretary Roy Rickhuss described it as an “extremely worrying time” for the union’s members – and said jobs must be protected in the event of restructuring or a transition to new ownership.
Calling for 12 months of pension contributions to be secured alongside this month’s paychecks, he added: “Steelworkers at Liberty Steel are highly skilled and hugely experienced; they are quite frankly irreplaceable and will be critical to delivering future success for the businesses.”
Mr Rickhuss said the union has received “firm assurances” that efforts to address pay and pensions are under way – and welcomed the government’s intervention.
“However, in taking control of the business the government has assumed responsibility for our livelihoods and our communities, and we will of course be holding them to account,” he added.
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April: How does a steel furnace work?
Bosses at Speciality Steels have said the move to wind up the business is “irrational” as a plan had been presented to courts that would have led to new investment in the UK steel sector.
“Instead, liquidation will now impose prolonged uncertainty and significant costs on UK taxpayers for settlements and related expenses, despite the availability of a commercial solution,” chief transformation officer Jeffrey Kabel added.
On Thursday, a government spokesperson said ministers “remain committed to a bright and sustainable future for steelmaking and steelmaking jobs in the UK”.