A NEW addition to a beloved TV drama has hinted the show will end after series eight – despite boasting an all-star cast.

Spy thriller Slow Horses launched on Apple TV in April 2022, starring Sir in the lead role of Jackson Lamb.

Gary Oldman as Jackson Lamb in a scene from "Slow Horses."
Slow Horses launched in 2022 – with Gary Oldman playing the lead role Credit: AP
Michael McElhatton attends the STARZ Dangerous Liaisons World Premiere.
Michael McElhatton (pictured) is a new cast member for series eight Credit: Getty

Irish actor Michael McElhatton has joined the cast for – and believes it may be its last.

The 63-year-old, known as Roose Bolton on , told The Times: “It’s a fantastic show but it’s had its time too.

“I think there’s only so much you can get out of a story, even though the books will keep coming.

Michael McElhatton as Roose Bolton in Game of Thrones.
Michael is well known for playing Roose Bolton on Game Of Thrones Credit: Handout
Gary Oldman and Jack Lowden pose together at the "Slow Horses" season 2 event.
Alongside Gary, actor Jack Lowden plays a major character in the series Credit: Getty

“Most series kind of fold after maybe three or four seasons. To go beyond that, I think generally they have to be based on books.”

Michael remarked that series eight would probably bring the series to a natural close. “

He also discussed working with Kristin Scott Thomas, who stars as director-general Diana Taverner on Slow Horses.

The actor said: “She’s absolutely extraordinary.

“I’ve been an enormous fan of hers for a long time.

“The real joy is to get a really good script and be surprised by a character.

“I’ve no ambitions to play particular parts, but I like being offered something that is a challenge and that excites me.

“If you get a chance to work on a really good script with some really talented actors, as I have done on so many shows and on Slow Horses at the moment, that’s the real joy.”

The Apple TV+ spy thriller was adapted by UK writer Will Smith from Mick Herron’s Slough House novels.

The Bafta-winning show concluded its sixth series last week and the seventh is scheduled to premiere late next year.

Meanwhile, series eight will be adapting Herron’s ninth novel, which is titled Clown Town.