Stuart Machin, CEO of Marks & Spencer, expressed shock over a recent cyberattack that affected the retailer's computer systems.Despite the chaos caused by the attack, Machin described it as a setback rather than a crisis, emphasizing the need to stay composed.The cyberattack disrupted operations, leading to challenges in stores and online, with an estimated profit loss of £300 million for M&S.Machin aims to accelerate M&S's digital transformation in response to the incident and remains focused on transparency and moving forward.