A documentary looking at Britain's biggest mass poisoning will air on BBC Two tonight. BBC's 'Poison Water' will explore the scandal in north Cornwall in 1988, when water to 20,000 homes was contaminated with aluminium levels thousands of times higher than acceptable limits. Exploring accusations of greed and cover-up, Poison Water tells the story of shattered public trust, safety compromised and a community’s search for the truth amid a devastating scandal. The incident quickly became a public