Overview: Are the News of the World phone hacking allegations the equivalent for journalists of the MPs expenses scandal and a watershed moment for the profession in this country? Prime Minister David Cameron has promised a public inquiry after a police investigation ends - but Labour says it must happen sooner. Michael Crick and Richard Watson will have the latest on the story and we will be joined by guests to discuss. We have a piece on how Britain is slipping behind other countries in the fight against child sex abuse. Plus Jeremy will be talking to Professor Martin Seligman, the American psychologist whose work inspired the prime minister's plan to measure the nation's happiness. Apparently, "happiness is out, flourishing is in" - but is this the sort of thing governments should be getting involved in?