By Jess Jones London’s tech businesses have long clustered around Old Street and latterly Stratford. But could the new Design District in Greenwich be set to steal the crown? That’s what London’s so-calledDesign District anticipates, as it has lured in a cohort of creative tech businesses, including music producer Brain Audio and immersive events space Engage Works. Both of these companies relocated from Hackney and Aldgate, respectively, in search of purpose-built spaces and improved facilities. They turned to the capital’s so-called design district, the first dedicatedhub for creative indust…