Burberry, which celebrates its 170th anniversary next year, has long had a hand in defining what Britain looks like to the rest of the world. Founded in 1856 by Thomas Burberry, the brand built its reputation on manufacturing trench coats for soldiers in two world wars. It was then made modern by Christopher Bailey, who turned it into a fashion phenomenon in the first decade of the 21st century. Today, it is Britain’s best-known luxury brand, with a market capitalisation of £4.15bn, and…

