In the second part of his investigation into what we do and make in Britain, Evan Davis argues it's right for Britain to concentrate on excelling in the knowledge economy.Industries such as pharmaceuticals and technology, which rely on innovation creativity and invention, can contribute greatly to the nation's bank balance. Evan travels to Silicon Fen outside Cambridge to see the high-tech company worth billions after designing chips for mobile phones, and tells the story of how one invention transformed the fortunes of glass makers Pilkington. He also visits China to investigate how British branding and marketing expertise is faring in this new and booming market.