2/3. Advertising. Advertisers claim that their work is an essential part of the market economy, providing vital information to consumers. They say that, without the industry, Britain's thriving independent media wouldn't exist. But critics say advertising is a corrupting and manipulative influence on our lives. Its message is that we are inadequate without certain products and sell us lifestyles that most people can never have. Which view is right? Diana Madill chairs a debate between writer Judith Williamson and Hamish Pringle of the Institute of Advertising Practitioners. Repeated from Wednesday