The Polanski effect? These charts reveal how much the Greens have advanced

The Green party has made gains under its leader - but there is also uncertainty ahead

The Greens talk of a Polanski effect" - a surge of momentum and visibility since Zack Polanski became leader, as the party gains attention in an increasingly fragmented political landscape.

The polls offer the clearest signal so far of whether that narrative is borne out in public support. But they are not the only thing to consider and experts say the reality is hard to be certain about.