Thousands of people died after being given infected blood transfusions by the NHS.
They were people with haemophilia, women giving birth, and cancer patients who died after contracting HIV or Hepatitis C from infected blood.
An inquiry has been studying millions of pages of evidence from hundreds of sources and witnesses for six years.
From its source in the early 1970s via warnings, missed opportunities, delays and perhaps even deliberate cover ups, this episode of the Sky News Daily explores the story behind the worst treatment scandal in NHS history.
Niall Paterson is joined by Sky's science and technology editor Tom Clarke in preparation for the final report from the inquiry - due to be published on Monday.
Producer: Emma Rae Woodhouse
Editor: Wendy Parker