By Adam Bloodworth Returning to the iconic restaurant as Jason Atherton’s City Social turns 10, by Adam Bloodworth City Social premiered in 2013 amid a scramble among London chefs to open everhigher restaurants at the pinnacle of our skyscrapers. Duck and Waffle became a celeb magnet when it opened a year earlier, Searcys members’ club was flirting with the idea of offering non card-holding plebs a table at the top of the Gherkin, and Gong at the Shard was having its inaugural fling. Jason Atherton was at the top of his game – his Pollen Street Social was awarded a Michelin star six months aft…