'Peaky Blinders' boss Steven Knight is thinking about spin-offs for the future.

Steven Knight

Steven Knight

The BBC's gangster period drama - which won Best Drama Series at the National Television Awards earlier this week - is set for a sixth series, and the show's creator hinted there is more to come once the main story comes to an end.

He told the Radio Times magazine: "I know how it's going to end, this particular incarnation of the family story, I know that it's going to end at the beginning of the Second World War," he explained. "But after that I think that the momentum is such that maybe we will continue with other bits of the story."

Steven also laughed off the idea of killing off Cillian Murphy's alter ego Tommy Shelby.

He joked: "Dead? Never - he's immortal."

While a prequel could happen one day, the writer admitted there are certain problems with that when it comes to limiting the story you can tell.

He explained: "The problem with prequel is you're limiting yourself as to where it can go.

"You can't kill a character who can show up in the series."

The showrunner's comments come after he admitted last year he could even look into a big screen version of the hit drama.

He said: "I'm writing series six at the moment. That's almost done. Then I'm going to do series seven, then I'm looking at spin-offs, maybe a movie. It's up to us. It's up to the people involved."

Meanwhile, Steven has also urged fans to "expect the unexpected" as they look forward to the sixth season.

He teased: "[It's going to be] better than ever. It's the best yet. It's moving the story forward. We always jump in time so we are into the 30s. Expect the unexpected."