The true scale of the number of medical trials using infected blood products on children in the 1970s and 80s has been revealed by documents seen by BBC News.

They reveal a secret world of unsafe clinical testing involving children in the UK, as doctors placed research goals ahead of patients' needs.

They continued for more than 15 years, involved hundreds of people, and infected most with hepatitis C and HIV.
One surviving patient told the BBC he was treated like a "guinea pig".

The trials involved children with blood clotting disorders, when families had often not consented to them taking part. The majority of the children who enrolled are now dead.