Invisible DANGER

How a toxic chemical entered North Cornwall's drinking water supply...

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Poison Water Wednesday, 9pm, BBC2

On the morning of 7 July 1988, Doug Cross boiled the kettle at his home in Camelford, Cornwall, only for the hot water to curdle bizarrely. Later, when his wife Carole ran a bath, the water turned blue.

Yet despite thousands of complaints, including dizziness, vomiting, diarrhoea, blistered skin and mouth ulcers, the then South West Water Authority insisted the water was safe to drink, even advising people to mix it with orange juice to make it more palatable.