Around 7m people in the UK are involved in illegal downloads

"Around seven million people in the UK are involved in illegal downloads, costing the economy tens of billions of pounds, government advisers say. Researchers found 1.3m people using one file-sharing network on one weekday and estimated that over a year they had free access to material worth £12bn."
Source: Strategic Advisory Board for Intellectual Property(SABIP), quoted by the BBC, 28th May 2009