So, in season 4, I wanted to have a reason that they all have to go back.

They have to go back to their roots and rediscover the place, looking at it through new eyes.

I thought that would be an interesting way to platform the series.

[Luca Changretta] is the threat.

He is a gangster on a different scale to the Peakys.

In a sense, hes a mirror image of Tommy.

In another way, hes what Tommy would want to be.

Hes also what Tommy fears he might become.

But the danger comes as a consequence to an incident which happens in series 3.

Adrien had great fun playing the villain and hes brilliant.

How exactly did Brody get involved in this very British show?

Jack is Aidans son, a boxer.

We were saying, We probably want an actor who can box rather than a boxer who can act.

And we found that he was both.

Knight hopes the six-episode season leaves viewers feeling one thing, if nothing else.

Shocked, he laughs.

Hopefully, deeply, deeply traumatized.

The ending of season 4?

I defy anyone to guess whats going to happen.

Its a surprise of a different kind.

Watch the U.K. trailer forPeaky Blindersseason 4, above.