The Information Commissioner's Office (ICO) is back to doing what it does best today, slapping Carphone Warehouse with a £400,000 fine for a 2015 data breach that exposed the personal information of over 3 million customers and 1,000 staff. It's one of the heftiest invoices the ICO has ever written up, though TalkTalk was fined just as much for failing to protect user data from a cyberattack that same year. Carphone Warehouse suffered a comparably serious breach that affected several of the company's brands. Not only were names, addresses, dates of birth and other personal details exposed, but the "historical" card details of 18,000 customers. According to the ICO, though, "there has been no evidence that the data has resulted in identify theft or fraud."