Zack Polanski's honeymoon is over

It's nearly a year since Zack Polanski took the reins of the Green party.    In many ways the party has never been so successful – with five MPs, leading six local authorities and a leader who cuts through with the public.    But now the Greens have to contend with a new – and relatively popular – Prime Minister, and internal factions within the party threaten to make life difficult for Polanski as he heads towards the summer conference.   How is the Green leader faring one year on?   Anoosh Chakelian is joined by Ailbhe Rea and Megan Kenyon   Produced by Chris Stone