8/11. Hosepipe bans, dwindling river flows and half-full reservoirs - the signs of water shortage are growing across some of Britain's most populated areas. The last big drought nine years ago spelt out the need to cut water demand and conserve vital supplies if another crisis was to be averted. So what measures were taken, and why haven't they worked? Reporter Julian O'Halloran. Producer Rob Cave Repeated on Sunday at 5pm