Shirine Khoury-Haq's departure comes after a troubled year, in which the retailer suffered a cyber-attack and faced allegations about its workplace culture. The boss of the Co-op is stepping down weeks after the BBC reported on claims of a "toxic culture" at the top of the food and services group. A letter sent to Co-op board members had complained of "fear and alienation" among even senior staff who fel... [2479 chars]