We visit the London Motor Show where we talk to Andreas Herrmann, co-author of a new book "Autonomous Driving - How the driverless revolution will change the world". Plus, tech giants such as Facebook and Google don't charge for their services up-front, so how should their economic contribution be measured? Renowned economist Erik Brynjolfsson has some suggestions. And, we learn about the challenges of the startup scene in Libya from Benghazi-based entrepreneur Khaled Elmufti. Presented by Rory Cellan-Jones, with BBC tech reporter Zoe Kleinman, and special guest Shona Ghosh, senior tech reporter at Business Insider. (Image: Passengers getting on a self-driving minibus at Shanghai Jiao Tong University in Shanghai, Credit: AFP/ Getty Images).