Imagine you were being constantly threatened and abused by someone who wouldn't leave you alone. And no-one believed you. Stalking affects an estimated two million people over in Britain each year, most of them women. Panorama tells the extraordinary story of one woman who's been recording years of abuse - as it takes away her job, her home and her child. Reporter Richard Bilton investigates how the UK failing to adequately tackle the ongoing problem of stalkers. And the internet probably isn't helping.