Bloomberg's Giles Turner speaks to London tech leaders Jo Bertram, Chief Digital & Strategy Officer for O2; Sherry Coutu, Chair of Raspberry Pi, Founders4Schools, Workfinder & The Scaleup Institute; Ronan Harris, Managing Director, Google UK & Ireland; and Russ Shaw, Founder, Tech London Advocates & Global Tech Advocates at the Bloomberg Sooner Than You Think Summit in London about the city's future as an international tech hub in post-Brexit Europe.