The BBC reveals that staff were told to ‘keep quiet’ after accidental Camelford poisoning.

Staff from a company involved in the UK’s worst mass water poisoning were told to keep quiet about what had happened, an inquest has been told.

Twenty tonnes of aluminium sulphate were accidentally added to the water supply in Camelford, Cornwall, in 1988.

A former manager at the South West Water Authority (SWWA) said senior managers did not want the public knowing what had gone wrong that July.

Three weeks passed before the public were alerted. The story gives examples of people who died from the poison.