Silicon Roundabout gets Brexit jitters

London’s buoyant tech hub faces a struggle to keep attracting talent and money as the EU ‘turns off tap’ for fundingIt was earlier this summer when Justin Grierson noticed that the number of “hackathons” seemed to be trailing off around “Silicon Roundabout”, the east London area touted as Britain’s answer to the Californian valley that is home to technology giants Google and Facebook.“Last year there used to be at least two every weekend and