The British actress, who played Holly Winshaw, a 14-year-old victim in Three Girls, dedicated her award to the bravery of the abused girls and their struggle for justice.
"My embarrassment about it or my kind of shame or embarrassment of people talking about my worth and how much I earn, is nothing compared to the fact that then if people are now aware, people are not going to be able to make those mistakes again or make those decisions again and if that's what's good comes out of it then I am very proud of it". "Soon maybe they will be here as well because I think they deserve to be", he said during his acceptance speech.
Addressing her Bafta nomination, she said: "I am so proud of the show and I'm so proud of everyone's work on it, and it just feels incredible when you do something and people enjoy it and watch it anyway and then to come to something like this, it's lovely".
Peaky Blinders scooped the top prize for Best Drama Series and the Best Comedy Entertainment Programme award was given to Murder in Successville.
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Cameron Jerome's solitary headed strike was enough to give Derby County the slimmest of advantages over Fulham in the first leg of their Championship play-offs semi-final first leg at Pride Park last week.
Britain's Got Talent won entertainment programme and Casualty was named best soap and continuing drama.
The award for factual series went to Ambulance, and Love Island won for reality or constructed factual.
Sean Bean won the award for Leading Actor for his performance as a Catholic priest in Broken against Joe Cole for the "Hang the DJ" episode of Black Mirror, Tim Piggott-Smith for King Charles III and Jack Rowan for Born to Kill.
The show was also a big victor at the BAFTA TV Craft Awards and Philippa Lowthorpe picked up in the Director: Fiction category, Uni Ni Dhonghaile in the Editing: Fiction category and Nicole Taylor, the Writer: Drama category.