https://www.theguardian.com/technology/2018/jun/12/yahoo-fined-hack-ico-uk-accounts-russia

ICO says firm ‘failed to prevent’ 2014 Russia-sponsored hack after 500m accounts compromised

Yahoo has been fined £250,000 over a hack from 2014 that affected more than 515,000 UK email accounts co-branded with Sky, the Information Commissioner’s Office has announced.