Yahoo, Tesco, Amazon: Everything that matters this morning

Yahoo data hack ‘affected all accounts’
Last year, Yahoo was forced to admit that data from more than 1 billion user accounts was compromised by hackers in August 2013.
But the damage is worse than originally anticipated. The tech company revealed yesterday (3 October) that every one of its 3 billion accounts was affected by data theft.
Yahoo included the finding in an update to its account security update page. The company said it will begin alerting accounts that were not previousl