Boris Johnson will promote London Tech City to overseas investors today, making him the first high-ranking UK politician to use the video chat platform. The session, which will take place at 5 pm at the InnoTech Summit in London, is aimed at driving awareness of the UK digital economy to help attract investment. He will speak with U.S. venture capitalists who will join the video chat from InnoTech Summits held at 9 am (Pacific Standard Time) in Silicon Beach, Los Angeles, and San Francisco.