hen the billionaire chief executive of AI chipmaker Nvidia threw a party in central London for Donald Trumps state visit in September, the power imbalance between Silicon Valley and British politicians was vividly exposed. Jensen Huang hastened to the stage after meetings at Chequers and rallied his hundreds of guests to cheer on the power of AI. In front of a huge Nvidia logo, he urged the venture capitalists before him to herald “a new industrial revolution”, announced billions of pounds in...