The TalkTalk data breach of 2015 was one of the most high profile cybersecurity incidents in the UK. Initially attributed to sophisticated hackers and feared to have exposed the personal data of over 4 million customers, it was later revealed to be the work of teenagers using basic techniques to exploit vulnerabilities in the company’s database. But the damage was already done for TalkTalk.

In this episode of "What Just Happened?," hosts Kate Hartley and Tamara Littleton are joined by seasoned crisis specialist Catherine Colloms to talk about how the breach highlighted systemic failings in TalkTalk’s cybersecurity measures.

TalkTalk CEO Dido Harding faced intense media scrutiny throughout the crisis, beginning with an appearance on Newsnight that set the tone for what was to come. While praised for taking responsibility and showing empathy, Harding was criticised for her lack of technical knowledge and for revealing sensitive details in interviews. The fallout included reputational damage, customer losses, and a halving of profits the following year.

A full transcript of today's show is available to read here.