https://www.theguardian.com/commentisfree/2019/oct/20/how-successful-was-britain-plan-for-its-own-silicon-valley-silicon-roundabout

Policymakers might learn from London’s Silicon Roundabout experience

Every city wants a cluster, a concentration of high-productivity firms and workers beavering away in a particular industry in a particular place. Proximity means ideas and productivity growing and spreading. Who doesn’t want their own Silicon Valley?