As of January 2025, the most significant data breach incident in the United Kingdom (UK) was the 2017-2018 Dixons Carphone breach. As a result of this incident, 14 million user records were affected, and 5.6 million payment card information was exposed. The Equifax data breach between 2011 and 2016 impacted over 15 million customers nationwide.
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UpGuard. (January 2, 2025). Most significant data breaches in the United Kingdom (UK) as of January 2025, by impact [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 19, 2026, from /statistics/1386728/uk-biggest-data-breaches/
UpGuard. "Most significant data breaches in the United Kingdom (UK) as of January 2025, by impact." Chart. January 2, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 19, 2026. /statistics/1386728/uk-biggest-data-breaches/
UpGuard. (2025). Most significant data breaches in the United Kingdom (UK) as of January 2025, by impact. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 19, 2026. /statistics/1386728/uk-biggest-data-breaches/
UpGuard. "Most Significant Data Breaches in The United Kingdom (Uk) as of January 2025, by Impact." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 2 Jan 2025, /statistics/1386728/uk-biggest-data-breaches/
UpGuard, Most significant data breaches in the United Kingdom (UK) as of January 2025, by impact ÌÇÐÄÆƽâ°æ, /statistics/1386728/uk-biggest-data-breaches/ (last visited July 19, 2026)
Most significant data breaches in the United Kingdom (UK) as of January 2025, by impact [Graph], UpGuard, January 2, 2025. [Online]. Available: /statistics/1386728/uk-biggest-data-breaches/
