Dido Harding, CEO of TalkTalk, has revealed that she received an email demanding a ransom from a group claiming to be behind the company's recent hack. She said she did not know whether the email was legitimate, but the Metropolitan police is investigating the email, along with the attack. The company was hit last week for the third time. The attack exposed the data of more than 4 million users including: names, dates of birth, email addresses, phone numbers and credit card details.