Dixons Carphone says it has been the victim of an "unauthorised data access" in which millions of customer bank card details were targeted.
Dixons Carphone said it had immediately notified the relevant card companies so that they could protect customers.
Dixons Carphone said that "unauthorised access" of data held by the company had prompted an investigation, the hiring of external security experts and efforts to shore up its security defences.
Because the data breach dates back to past year it will be dealt with by the ICO under the powers of the Data Protection Act 1998 and not the European Union General Data Protection Regulation (GDPR) which went into effect on May 25.
Dixons Carphone, the firm which runs well-known tech outlets in the United Kingdom including Currys, PC World, and Carphone Warehouse admits that it suffered a data breach in July 2017.
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It said the data accessed did not contain Pin codes, card verification values (CVV) or any authentication data allowing cardholder identification or a purchase to be made.
The company said in a statement: Our investigation is ongoing and now indicates that there was an attempt to compromise 5.9 million cards in one of the processing systems of Currys PC World and Dixons'.
The company said that of the cards not secured with chip and pin, none were reported to have been misused, the rest of the cards should be secure.
Dixons Carphone said the 1.2 million personal data records that were hacked saw non-financial personal data, such as name, address or email address, accessed. "We have no evidence to date of any fraudulent use of the data as result of these incidents", the company said.
"We are extremely disappointed and sorry for any upset this may cause".
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The National Cyber Security Centre has warned people to be mindful of potential fraud and follow-up campaigns.
Things haven't been looking too great for Dixons Carphone.
"The NCSC website offers advice to organisations about ensuring their online security is as robust as possible, including guidance on protecting bulk personal data from cyber attack", they added.
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