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Sharing a photo of the production script - which also reveals that the first episode of the new season looks like it'll be called 'Black Day' - Byrne wrote on Instagram: "We are in pre-production on Season 6. More to come. By Order of..."
Byrne was a director on season five, but as he's back on board for the next instalment, he becomes the first to return for a second series.
Back in August 2019, he told GQ: "I'm reading the scripts at the moment, which Steven is writing. I start properly on series six in early November. Then we start shooting early next year, is the plan."
Byrne also gave a bit away about the direction of the next series, saying: "[Tommy] has to play a long game. He has to show patience and calm, when other people want to react. He's battling his own instincts and behaviour.
"That is the most dangerous thing. He wants to just kill Mosley, but he knows he can't. He has to fight him in a different way. Mosley brings out the very worst in Tommy Shelby. I think that's where Steven Knight's writing is so sophisticated. In order to fight Mosley, Tommy winds up having to fight himself."
Peaky Blinders returned for its fifth series last September, with Tommy Shelby (Cillian Murphy) moving into the world of politics to face his toughest foe yet: far-right fascist Oswald Mosely (Sam Claflin).
We don't have a release date for its follow-up just yet, but it looks like things are moving along nicely, with Production Week also reporting that shooting begins in Scotland and Liverpool on 11 February.
He added of season six: "I have read three of the scripts and they're great, I did say it feels like part one of two and that was purely based on the fact that you have this cliffhanger.
"I want to know what happens in the field, I had no idea, I mean I do now. At the time when we were shooting it. Nobody knew, so I wanted to commit to playing it. Cillian didn't know either."
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