Julie Walters called for funding for important drama productions to be secured after scooping the best actress TV Bafta.
Walters was named Leading Actress for her role in Channel 4 drama Mo, in which she played late Labour politician Mo Mowlam.
Backstage at the ceremony at London Palladium, she was asked if there should be more funding for drama.
"Important drama touches people," she said. "I'm not saying it changes the world but seeds are planted. It's really important and, yes, the money should be made available."
Walters said she had harboured "huge doubts" about whether she could portray Mowlam. She said: "I got some footage of Mo and I thought, 'Oh my God, I don't think I can do this, that voice'.
"Everything was so specific about her. I rang the agent and said, 'I don't think I can do this', and he said b*******, basically!"
She said she had driven people mad trying to get Mowlam's voice exactly right.
Walters had also been nominated for her performance in A Short Stay In Switzerland, the BBC1 drama inspired by the story of Dr Anne Turner, who took her own life in Zurich in 2006.
She said she was worried "that I would go up and thank the BBC instead of Channel 4, but it was odd because both of them meant a huge amount to me... wonderful scripts and very special somehow".
She added: "It was very hard work being Mo actually... Mo was so dynamic and she drove every scene and she was in every scene, so it was hard work."
Soap fan Walters was asked if she would like a role in Coronation Street. She said she was once on the set of EastEnders and "I could hardly speak. I'd love a bit of something, yes."