It's just six weeks since Zack Polanski became leader of the Green party. He's not even an MP. And yet, in that short space of time, he's become something of a political rockstar for those on the left of British politics.

His party is shooting up in the polls, he's attracted a devout and growing following on social media, and his modern style of communication is marking him out against what can at times feel like a rather stale political establishment in Westminster.

In this extended interview, Lewis speaks to Polanski about his political journey and about his radical vision. Why does he support the break up of the United Kingdom? Does he recognise his stance on NATO sets him at odds with the public? And could Labour MPs be about to join him?

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