Downton Abbey will continue after its upcoming fifth series and could run until 2020.
The show's executive producer Gareth Neame has knocked back speculation the show would end this year, after writer Julian Fellowes recently said the drama was "not going to go on forever".
He said the period drama series, whose fourth series premiered in the US at the weekend, would end eventually, but he did not know when.
"It won't go on forever," he told AFP. "No show does. The show will live to an age of somewhere between five and 10 years."
The period drama, which follows the Crawley family and their servants, will return to ITV later this year.
Previously, the series has included Cheltenham actress Holly Thomas, who spent six months on set and appeared in two series as Madge, maid to Lady Edith.
The former Cheltenham College pupil, 27, said her time on set was “an amazing experience”.
“I had the most amazing time and met all the main characters, who were all very nice and made me feel very much welcomed into the cast,” she said.