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It is growing at more than 5% a year globally - with new technology hubs like London, Berlin, and Bangalore threatening the traditional pre-eminence of Silicon Valley. Or are they? With the help of international financiers Michael Moritz, Suranga Chandratillake, Yannick Roux, John Medved and Jeremy Milward, we look at the pretenders to the Valley's throne, its enduring secrets, and what it would take to replace it.

(Photo: Tech Hub signs outside an office space near Silicon Roundabout, London. Credit: Getty Images)