Panorama: Is Britain Full?

Panorama investigates just how overcrowded the UK actually is. The latest official population projection has it rising over the next twenty years to 70 million. If it does, everybody will feel the effects - from where we live to where our kids go to school. Some argue that the extra population, much of it made up of new immigrants, will help boost the British economy, but will it? And what can politicians actually do to stop the growth?