Collecting her accolade, she said: "I've led a charmed life, I really have. I've worked with incredible people. I started in television in black and white. I have to say a very big thank you to Graham Norton and Paul [O'Grady] for looking after me. And thank you to the viewers for making me feel so welcome and for loving my shows over the years. This is for you."
Sean Harris was "surprised" to win the Leading Actor gong for his portrayal of a killer in the drama Southcliffe.
Coronation Street won Best Soap & Continuing Drama, while the Long Lost Family was shocked to win the Features BAFTA ahead of last year's winner The Great British Bake Off.
Ant & Dec's Saturday Night Takeaway won Best Entertainment Programme and the two stars also took home the Best Entertainment Performance award.
BAFTA TV Awards 2014 Full List of Winners:
Entertainment Programme - Ant & Dec's Saturday Night Takeaway
Sport and Live Event - The Ashes 2013 - 1st Test, Day 5
Current Affairs - Syria: Across The Lines (Dispatches)
Mini Series - In The Flesh
Single Documentary - The Murder Trial
News Coverage - ITV News At Ten: Woolwich Attacks
Features - Long Lost Family
Soap and Continuing Drama - Coronation Street
Specialist Factual - David Attenborough's Natural History Museum Alive 3D
Supporting Actor - David Bradley, Broadchurch
Comedy and Comedy Entertainment Programme - A League of Their Own
Supporting Actress - Sarah Lancashire, Last Tango in Halifax
Reality & Constructed Factual - Gogglebox
Situation Comedy - Him & Her: The Wedding
Special Award - Cilla Black
Drama Series - Broadchurch
Female Performance in a Comedy Programme - Katherine Parkinson, The IT Crowd
Single Drama - Conflict
Male Performance in a Comedy Programme - Richard Ayoade, The IT Crowd
Factual Series - Bedlam
Radio Times Audience Award - Doctor Who: Day of the Doctor
Entertainment Performance - Ant & Dec's Saturday Night Takeaway
Leading Actress - Olivia Colman, Broadchurch
Leading Actor - Sean Harris, Southcliffe
- Bang! Showbiz