The corporation said it was "incredibly proud" of all three shows, but that it must make savings.
The Luton-born actor appeared in the most watched episode of Doctor Who alongside Tom Baker.
The figures are contained in Ofcom's latest Media Nations report for Northern Ireland.
She plays Lady Baela Targaryen in HBO's Game of Thrones prequel, and is the ninth celebrity to be confirmed.
The BBC One show's co-host will swap the TV sofa for the presenter's chair on Radio 5 Live Breakfast.
For the first time in the history of the UK series, only three couples were in the final after several twists.
From the comeback of Apple TV's hit football comedy to a dark teen thriller from Ryan Murphy, and new DC superhero series Lanterns – these are the best series to watch and stream.
Homes across the island have been left without access since Sunday.
One of Britain's best known comedians and naturalists, his life was plagued by bouts of acute depression which saw many visits to psychiatric hospitals.
