By me, on the Mishcon de Reya website.
…a recent request to the ICO under the Freedom of Information Act 2000 (FOIA) has revealed that, from the available data, of the 21705 personal data breaches notified to the ICO since May 2018, 14,365 were notified within 72 hours, and 7340 were not – meaning that approximately one third of personal data breaches are reported later than within 72 hours