Chernobyl: The New Evidence

Channel 4, 7.30pm

Much has been said about the terrifying and traumatic events of April 26, 1986, but this disturbing two-part programme claims to offer the definitive account.

Its makers had access to newly declassified documents from the KGB archive, which suggest that the authorities knew the site was unsafe during its construction and that it was an accident waiting to happen. ★★★★☆