Factor VIII
Thatcher was prime minister during what "The Guardian" described as "the worst treatment disaster in the history of the NHS." Thousands of haemophiliacs were infected with HIV, Hepatitis C, or both, via the clotting-agent Factor VIII. Britain had imported infected supplies of Factor VIII from risky overseas commercial sources; it is generally thought that this was because the Thatcher government had not made public funding available for the NHS sufficient in creating its own supplies.