If the German Green Party is anything to go by they will be constrained by the bureaucracy of the political system and compromises with coalition partners. Like the German Greens, I would imagine that if UK Greens get anywhere near a coalition with Labour then they’d be less critical publically but push for things to be done on the ground (like more renewable projects, rewilding and projects to combat air pollution). I suspect their social policies would be less prominent and they would fall in line with coalition agreements.

I reckon they’ll not bark or bite… just gnaw a bit.