An insider revealed that M&S lacked a plan for cyber attacks, resulting in staff sleeping in the office due to “paranoia” and “chaos.” The lack of preparedness created a stressful environment as employees struggled to manage the fallout from the security breaches.

Clothing shortages, food waste and millions lost each day: inside the M&S cyber-attack chaos – The Guardian
The M&S cyber-attack caused significant disruptions, leading to clothing shortages and substantial food waste. The incident resulted in millions lost daily, highlighting the vulnerabilities in