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The Office for National Statistics (ONS) is making major changes to how it gathers some of the UK’s most important data. These figures shape decisions on wages, benefits, and public spending.

One of the biggest shifts involves how inflation is measured, which is changing on Tuesday. The Consumer Price Index (CPI), which tracks the cost of everyday essentials like food, energy, and transport, is being updated with a new system that aims to capture price changes more accurately.

This matters because inflation figures influence the Bank of England’s decisions on interest rates, which in turn affect the cost of borrowing, savings, and even rent.

For workers, inflation also plays a role in wage negotiations. This is because when prices rise, there’s often pressure on employers and the government to increase salaries, pensions, and benefits.

The ONS will continue sending researchers to shops to check prices and speak to retailers, but from this month, a new digital system will speed up how the data is processed.

It’s also testing a new method using real checkout data from supermarkets. Instead of just recording shelf prices, it will track what people actually pay, including discounts from loyalty schemes like Clubcard and Nectar. This should give a more accurate picture of real spending habits, with full rollout expected by 2026.

The change has been brought about over concerns the previous method measured price changes but failed to capture how consumers changed what they buy as a result.

Take the example of butter, which has gone up in price by 18% in the past year. That increase was reflected in the CPI, influencing the overall inflation figure. However, many consumers will have switched to a dairy spread or margarine rather than keep paying for the more expensive butter.

How is inflation data changing?

While this should improve inflation accuracy, tracking individual product prices may become harder. Sky News’ Spending Calculator, which helps users track price changes, will need updates and won’t be refreshed this month.

An ONS spokesperson said: “From next year we will be replacing much of the physical price collection in supermarkets with information from supermarket tills. While we won’t know what each consumer has bought, we will know both the price and quality of items sold in shops up and down the country, marking a step-change in our understanding of inflation and consumer behaviour.”

Data reliability concerns prompt changes

While these changes to the inflation data are intended to better reflect consumer behaviour, other changes are being introduced due to concerns over reliability.

One of the most affected datasets is the Labour Force Survey (LFS), the UK’s largest household study, which measures the state of the labour market and helps shape decisions on interest rates and employment. However, plummeting response rates mean its reliability is now in question.

“I think policymakers just don’t have as much trust or confidence in the LFS, so they have to find other ways to get the clear insights they used to rely on the LFS for,” said Michael McMahon, professor of economics at Oxford and former Bank of England economist.

“The Bank of England has a set of regional agents who will go out and speak to businesses. They’ll speak to local bodies and even in some cases do citizens’ panels. They were doing that before the LFS issue. It’s just they have to rely on these alternatives more, because they can rely less on the LFS.”

The pandemic accelerated these issues when face-to-face LFS interviews were replaced with phone surveys, causing a sharp drop in participation.

Internal ONS emails, revealed by the Financial Times, showed how one key estimate’s sample size had “collapsed to only five individuals” — too small for reliable statistics.

Resolution Foundation analysis shows that HMRC payroll and self-employment data aligned with LFS estimates before 2020 but after the pandemic began to diverge.

To address this, the ONS is developing the Transformed Labour Force Survey (TLFS), using shorter questionnaires and shifting primarily to online responses, with some face-to-face interviews remaining.

Survey issues aren’t just affecting job figures, they’re also complicating GDP estimates.

The Living Costs and Food Survey (LCF), which tracks incomes and spending and is used for GDP estimates, has seen a sharp drop in response rates, with fewer than one in five forms completed as of December 2024. The survey is particularly time-consuming, requiring participants to log spending for two weeks. A new digital tool allowing receipts to be scanned is in development but won’t launch until late 2025.

For policymakers, these delays are frustrating. “It’s certainly a moment of embarrassment: the idea that the chancellor and the governor [of the Bank of England] go to G7 meetings, talk to other advanced economies, and explain why we don’t know how our labour market is doing with any great confidence,” said McMahon.

Flawed migration data

Recent improvements to the way the ONS gathers migration data also highlight significant failings in the recent past.

Long-term migration estimates are a vital part of public debate and key policy decisions.

Before COVID, migration estimates relied on traveller surveys at airports and ports. These surveys frequently underestimated migration levels, as they depended on people’s own predictions about how long they would stay in the UK.

Under this method, net migration was seen to have peaked in December 2022, at 764,000.

Now, the ONS has shifted to using visa records, higher education statistics, and tax data to provide a clearer picture. Under this new method, it has become clear that net migration has been much higher than previously thought, peaking at 906,000 in June 2023.

Overall, the ONS increased its estimate for net migration in 2023 by more than 25%.

However, while these changes are making migration data more reliable, they also highlight how much of the political debate on immigration in recent years has been built on incomplete figures. The transition to administrative data is a step forward, but further refinements will be needed to ensure long-term accuracy.


The Data and Forensics team is a multi-skilled unit dedicated to providing transparent journalism from Sky News. We gather, analyse and visualise data to tell data-driven stories. We combine traditional reporting skills with advanced analysis of satellite images, social media and other open-source information. Through multimedia storytelling we aim to better explain the world while also showing how our journalism is done.

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UK to miss deadline to agree steel and aluminium tariffs

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UK to miss deadline to agree steel and aluminium tariffs

The UK will miss the White House-imposed deadline to agree a trade deal on steel and aluminium this week, according to insiders from government and industry.

Donald Trump had insisted that unless Britain could finalise the details of its metals trade deal with the US by 9 July, he would raise the tariffs faced by steel and aluminium imports from the 25% the UK currently pays to the 50% paid by other countries. If it could seal the deal, those tariffs could drop to zero.

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However, despite weeks of negotiations and promises that the deal would be completed by the end of June, talks have foundered on two key issues. First, the US is insisting that only steel “melted and poured” in the UK (in other words, forged in blast furnaces or electric arc furnaces) can be included in the deal. However, one of Britain’s biggest steel exporters to the US, Tata Steel, is not melting and pouring its UK steel because of the closure of its blast furnaces.

Second, the US is wary of the fact that while the government has taken control of British Steel, which operates Britain’s last remaining blast furnaces in Scunthorpe, the company itself still legally has Chinese owners.

Government insiders have told businesses they still expect to have a deal done by the end of this month, and that they are confident the White House will not impose the 50% tariffs for the time being. They say one of the chief challenges they face is that the administration is so overwhelmed by attempts to negotiate with other countries that they lack the bandwidth to deal with the small print on Britain’s deal.

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Inside the UK’s last blast furnaces

“As far as the Americans are concerned, the UK is already a done deal,” said one person close to the negotiations. The problem is that while a deal has been done on car and aerospace exports to the US, the metals element of the trade agreement is still some way from being signed. In the meantime, steel exports continue to incur tariffs – albeit lower than those imposed on other countries around the world.

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At least 13 postmasters may have taken their own lives, public inquiry into Post Office scandal finds

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At least 13 postmasters may have taken their own lives, public inquiry into Post Office scandal finds

At least 13 postmasters may have taken their own lives after being accused of wrongdoing based on evidence from the Horizon IT system that the Post Office and developers Fujitsu knew could be false, the public inquiry has found.

A further 59 people told the inquiry they considered ending their lives, 10 of whom tried on at least one occasion, while other postmasters and family members recount suffering from alcoholism and mental health disorders including anorexia and depression, family breakup, divorce, bankruptcy and personal abuse.

Follow latest on public inquiry into Post Office scandal

Writing in the first volume of the Post Office Horizon IT Inquiry report, chairman Sir Wyn Williams concludes that this enormous personal toll came despite senior employees at the Post Office knowing the Horizon IT system could produce accounts “which were illusory rather than real” even before it was rolled out to branches.

Sir Wyn said: “I am satisfied from the evidence that I have heard that a number of senior, and not so senior, employees of the Post Office knew or, at the very least, should have known that Legacy Horizon was capable of error… Yet, for all practical purposes, throughout the lifetime of Legacy Horizon, the Post Office maintained the fiction that its data was always accurate.”

Referring to the updated version of Horizon, known as Horizon Online, which also had “bugs errors and defects” that could create illusory accounts, he said: “I am satisfied that a number of employees of Fujitsu and the Post Office knew that this was so.”

The first volume of the report focuses on what Sir Wyn calls the “disastrous” impact of false accusations made against at least 1,000 postmasters, and the various redress schemes the Post Office and government has established since miscarriages of justice were identified and proven.

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‘It stole a lot from me’

Recommendations regarding the conduct of senior management of the Post Office, Fujitsu and ministers will come in a subsequent report, but Sir Wyn is clear that unjust and flawed prosecutions were knowingly pursued.

“All of these people are properly to be regarded as victims of wholly unacceptable behaviour perpetrated by a number of individuals employed by and/or associated with the Post Office and Fujitsu from time to time and by the Post Office and Fujitsu as institutions,” he says.

What are the inquiry’s recommendations?

Calling for urgent action from government and the Post Office to ensure “full and fair compensation”, he makes 19 recommendations including:

• Government and the Post Office to agree a definition of “full and fair” compensation to be used when agreeing payouts
• Ending “unnecessarily adversarial attitude” to initial offers that have depressed the value of payouts, ⁠and ensuring consistency across all four compensation schemes
• The creation of a standing body to administer financial redress to people wronged by public bodies
• Compensation to be extended to close family members of those affected who have suffered “serious negative consequences”
• The Post Office, Fujitsu and government agreeing a programme for “restorative justice”, a process that brings together those that have suffered harm with those that have caused it

Regarding the human impact of the Post Office’s pursuit of postmasters, including its use of unique powers of prosecution, Sir Wyn writes: “I do not think it is easy to exaggerate the trauma which persons are likely to suffer when they are the subject of criminal investigation, prosecution, conviction and sentence.”

He says that even the process of being interviewed under caution by Post Office investigators “will have been troubling at best and harrowing at worst”.

Read more:
Post Office inquiry lays bare heart-breaking legacy – analysis

‘Hostile and abusive behaviour’

The report finds that those wrongfully convicted were “subject to hostile and abusive behaviour” in their local communities, felt shame and embarrassment, with some feeling forced to move.

Detailing the impact on close family members of those prosecuted, Sir Wyn writes: “Wives, husbands, children and parents endured very significant suffering in the form of distress, worry and disruption to home life, in employment and education.

“In a number of cases, relationships with spouses broke down and ended in divorce or separation.

“In the most egregious cases, family members themselves suffered psychiatric illnesses or psychological problems and very significant financial losses… their suffering has been acute.”

The report includes 17 case studies of those affected by the scandal including some who have never spoken publicly before. They include Millie Castleton, daughter of Lee Castleton, one of the first postmasters prosecuted.

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Three things you need to know about Post Office report

She told the inquiry how her family being “branded thieves and liars” affected her mental health, and contributed to a diagnosis of anorexia that forced her to drop out of university.

Her account concludes: “Even now as I go into my career, I still find it so incredibly hard to trust anyone, even subconsciously. I sabotage myself by not asking for help with anything.

“I’m trying hard to break this cycle but I’m 26 and am very conscious that I may never be able to fully commit to natural trust. But my family is still fighting. I’m still fighting, as are many hundreds involved in the Post Office trial.”

Business Secretary Jonathan Reynolds said the inquiry’s report “marks an important milestone for sub-postmasters and their families”.

He added that he was “committed to ensuring wronged sub-postmasters are given full, fair, and prompt redress”.

“The recommendations contained in Sir Wyn’s report require careful reflection, including on further action to complete the redress schemes,” Mr Reynolds said.

“Government will promptly respond to the recommendations in full in parliament.”

Post Office minister Gareth Thomas said, “Sir Wyn’s report highlights a series of failings by the Post Office and various governments. His recommendations are immensely helpful as a guide for what is needed to finish the job”.

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Cyber attack on M&S involved ‘sophisticated impersonation’, chairman says

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Cyber attack on M&S involved 'sophisticated impersonation', chairman says

The chairman of Marks & Spencer has told MPs the company is “still in the rebuild mode” and will be for “some time to come” following a cyber attack which led to empty shelves and limited online operations for months.

Speaking publicly for the first time since the attack, Archie Norman declined to answer whether the business had paid a ransom.

“It’s a business decision, it’s a principal decision,” he told members of the Business and Trade Committee (BTC).

“The question you have to ask is – and I think all businesses should ask – is, when they look at the demand, what are they getting for it?

“Because once your systems are compromised and you’re going to have to rebuild anyway, maybe they’ve got exfiltrated data that you don’t want to publish. Maybe there’s something there, but in our case, substantially the damage had been done.”

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When asked again later in the BTC evidence session, Mr Norman said, “We’re not discussing any of the details of our interaction with the threat actor, including this subject, but that subject is fully shared with the NCA [National Crime Agency].”

“We don’t think it’s in the public interest to go into that subject on it, because it is a matter of law enforcement”, he added.

What happened?

The initial entry into M&S’s systems took place on 17 April through “sophisticated impersonation” that involved a third party, Mr Norman said.

It was two days later, on Easter Saturday, before the company became aware of the attack, and approximately a week after the intrusion, before the retailer heard directly from the attacker.

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Who is behind M&S cyberattack?

A day later, after learning of the attack, the authorities were notified, while customers were told on Tuesday, MPs heard.

As well as British authorities, the US FBI was contacted, who are “more muscled up in this zone” and were “very supportive”, Mr Norman said.

By the time the breach is clear, systems have already been compromised, the chairman said.

The group behind the attack may have been Scattered Spider, some of whom are believed to be English-speaking teenagers, but Mr Norman said M&S made an early decision that no one from the company would deal directly with the so-called “threat actor”.

“Anybody who’s suffered an event like ours, it would be foolish to say there’s not a thousand things you’d like to have done differently,” he added.

Advice for businesses

In a warning to other businesses, M&S’s general counsel and company secretary Nick Folland said firms should be prepared to operate without IT systems.

“One of the things that we would say to others is make sure you can run your business on pen and paper,” he said.

Awareness and planning for the threats of cybersecurity meant M&S had trebled the number of people working on cybersecurity to 80and doubled its expenditure.

“We curiously doubled our insurance cover last year”, Mr Norman added.

In a good position

The business was better positioned to deal with the strike than at the start of Mr Norman’s tenure, he said.

“The context of M&S is when I joined the business, it was a very broken business… our systems were in a pretty decrepit state.”

“So I have to say if this has happened then I think we would have been kippered.”

Read more:
UK to miss deadline to agree steel and aluminium tariffs
Flavour of what’s to come as first Post Office inquiry lays bare heart-breaking legacy

Recent profits meant the company was “muscled up”.

“Extensive” insurance cover means M&S expects to make an “unsurprisingly significant claim” and receive “substantial recovery”, though the process of finding out how much will take about 18 months.

The £300m sum M&S said it expected to lose as a result of the cyber attack does not include money it expects to claim via insurance. The financial hit was calculated at £300m as the chain department store was losing £10m a week by not operating online.

The incident has “not really” affected its future, Mr Norman said.

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