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The decision was taken by the channel's new controller Richard Woolfe, who has been charged with turning around Sky One's fortunes.
Although it has been a long-standing fixture in the Sky One schedule, ratings for the show have recently dropped to as low as 250,000.
"This amazing show will end spectacularly," said Woolfe. "I want it to finish on a high and don't want it to end in any other way.
Executive producer Jane Hewland, who has had to work to a budget of just £150,000 an hour, said she was "relieved" by the decision.
"Sky pushed us but we wanted to jump anyway," she told Broadcast. "I think it is beyond its shelf life and I'm bored of it."
The final, tenth series of 32 episodes begins filming this July and will air from September.
