The UK Information Commissioner’s Office (ICO) imposed a £500,000 penalty over security failures linked to a 2017–2018 cyberattack on retail systems operated by DSG Retail, a Dixons Carphone subsidiary. The penalty has been litigated: on 19 February 2026, the Court of Appeal allowed the ICO’s appeal on a legal issue and sent the case back to the First-tier Tribunal. That ruling did not decide whether DSG’s security measures were appropriate or what penalty, if any, should ultimately stand.
Who was fined, and what was the breach?
“Dixons” is shorthand in this story. The ICO issued its penalty notice to DSG Retail Limited, then a subsidiary of Dixons Carphone. The Upper Tribunal judgment says DSG is now Currys Group Limited. The attack targeted store systems associated with Currys PC World and Dixons Travel.
According to the Upper Tribunal, attackers were active from 24 July 2017 to 25 April 2018. They compromised point-of-sale (POS) terminals and obtained payment-card data from their memory. The Court of Appeal described the attackers scraping transaction details over about nine months, storing data on DSG servers and attempting to exfiltrate it.
How many payment cards and personal-data records were involved?
The Court of Appeal’s 2026 summary says more than 5.6 million payment cards were affected. For the great majority of EMV-protected cards, attackers obtained the card number (PAN) and expiry date, but not the cardholder’s name or information that would identify the cardholder. The Court of Appeal summarized the cases in which names were obtained as around 8,000; the Upper Tribunal’s more detailed account gives 8,628 cards without EMV protection for which attackers obtained the name, PAN and expiry date.
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The card figures are separate from the non-financial personal-data figures. The Upper Tribunal recorded approximately 18.5 million records of largely non-financial personal data as accessed. The records included names, addresses, postcodes, email addresses, dates of birth, telephone numbers, details of failed credit checks, partially concealed PANs linked with other data, and bank account details. The tribunal cautioned that its figures were approximate and might include duplication; they are not a count of unique people.
Early company estimates were different and changed as the incident was assessed. In June 2018, DSG reported an attempt to compromise 5.9 million cards and 1.2 million records containing non-financial personal data. In July it said approximately 10 million records might have been accessed. Those were company estimates at the time, not the later tribunal account, and should not be added to or treated as directly comparable with it.
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How did the ICO fine change through the appeals?
The incident predated the GDPR’s application, so the ICO’s 9 January 2020 penalty was issued under the Data Protection Act 1998. It concerned the Act’s seventh data protection principle, which required appropriate technical and organisational measures against unauthorised or unlawful processing of personal data and against accidental loss, destruction or damage. The Court of Appeal described £500,000 as the maximum penalty available under that law at the time.
| Date | Procedural step | What it established |
|---|---|---|
| 9 January 2020 | The ICO issued a monetary penalty notice to DSG Retail for £500,000. | The original penalty under the Data Protection Act 1998. |
| July 2022 | The First-tier Tribunal reduced the penalty to £250,000. | A substituted penalty, later affected by further appeal proceedings. |
| October 2024 | The Upper Tribunal identified legal errors concerning the personal-data analysis for EMV card data and the penalty assessment. | The case continued through the appeal process; this was not the final outcome. |
| 19 February 2026 | The Court of Appeal allowed the ICO’s appeal on a legal issue and remitted the case to the First-tier Tribunal. | The cited rulings do not establish a final penalty after remittal. |
The Court of Appeal held that a controller’s security duty could apply where information was personal data from the controller’s perspective even if the third party who obtained it could not identify the individuals. Lord Justice Warby wrote: “It is a protective duty, to take proportionate steps to guard against risk, not to guarantee a particular outcome.”
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The ruling resolved that legal question, not the remaining merits. It did not decide whether DSG’s actual measures were appropriate, whether any breach was serious enough to merit a penalty, or what amount, if any, should stand. The original £500,000 and the First-tier Tribunal’s £250,000 figure therefore should not be described as a final settled penalty.
What did the company say about the incident?
In its 9 January 2020 announcement, Dixons Carphone said DSG Retail had received the ICO notice and that it was considering grounds for appeal. The company said it had no confirmed evidence of customers suffering fraud or financial loss as a result, and described steps it said it had taken after discovering unauthorised access. That was the company’s statement, not a regulator finding that no harm occurred.
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Alex Baldock, then Chief Executive of Dixons Carphone, said: “We are very sorry for any inconvenience this historic incident caused to our customers.”
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should affected customers do?
The National Cyber Security Centre (NCSC) published incident-specific customer guidance on 30 July 2018. Its recommendations were intended for customers responding at that time; they do not establish that every customer remains at risk today.
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- Easy to Use: just remove the lid on the ID stamp blocker roller and open it, and then gently slide it on the place where the information needs to be covered. It is suitable for most ordinary paper with black words, and can protect your personal privacy in time
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- Monitor bank and financial accounts for suspicious transactions. Report concerns to the relevant provider or Action Fraud.
- Be cautious of unsolicited emails, calls or text messages asking for personal or login details. Look up an organisation’s contact details independently rather than relying on contact information in a suspicious message.
- Check credit information periodically through a reputable service, as the NCSC advised.
- Consider enabling two-factor authentication on important accounts.
The NCSC warned that stolen personal information could make fraudulent messages or calls more convincing. Its incident advice did not require customers to buy a security product or subscription.
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