By Bethany Wales Once the darling of the British high street, Marks and Spencer has had a turbulent ten years. Wracked by poor sales figures, rickety online infrastructure and a general identity crisis, the pandemic ushered in the retailer’s worst period in decades – although the foundations for this sudden downturn were laid long before Covid-19 launched its campaign of chaos. In 2012, Next overtook M&S as the most valuable clothing retailer on the London Stock Exchange for the first time, and over the next 10 years web-savvy brands like Asos and John Lewis would continue to make life hard fo…