When a Oxfordshire river turns brown, two locals ask the water company why. So begins an epic 10-year trail to the heart of one of the great corporate and regulatory scandals in our country’s history.

The drama continues. An eight-year-old girl dies after a trip to the beach. Was it the raw sewage dumped there?

The drama concludes as Dirty Business flushes out a story of pollution, criminal convictions and corporate wealth