In 2008, the Duchess teamed up with investigative reporter Chris Rogers after seeing his documentaries on child cruelty in Romanian orphanages.
She agreed to travel undercover to Turkey and Romania with Rogers, producer Tom Jones and her daughter, Eugenie.
The resulting documentary - Duchess and Daughters: Their Secret Mission - was screened on ITV1 and provoked a furious response from the Turkish authorities who accused her of a "smear campaign" against them.
For the documentary the Duchess wore a dark wig and green headscarf to slip into an orphanage in Ankara.
Secret cameras filmed teenagers tied to chairs and children with sores rocking back and forth in their chairs.
Independent