In 1992, the first official Western study of Chernobyl reported no evidence of health effects. However, another small team, led by British scientists Dr Keith Baverstock and Sir Dillwyn Williams, confirmed local reports of an epidemic of thyroid cancer that was clearly attributable to the disaster.
The programme shows how, opposed by powerful interests, the scientists battled to prove their claim - one that has grave implications for the nuclear industry worldwide.

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