Marks & Spencer’s “traumatic” cyber attack was believed to be instigated by hacking group Scattered Spider and a ransomware operation run by former computer gamers named DragonForce, its chairman has said.Archie Norman, who was quizzed by MPs, refused to say whether or not the retailer paid the group’s ransom money following the hack.M&S was left unable to take any online orders for more than six weeks when its systems were targeted by hackers at the end of April.