Let's start at the beginning - what sparked this idea?
I have to feel really moved to want to do something, I have to feel I've got something to say. I was wanting to make a film that could look at the way the world was going, which didn't seem terrifically good to me. I'm not a journalist and I'm not a current affairs maker, so what could I make? I decided that following Helen Clark about could be quite a good documentary - and it turns out it is.
I had no idea about the Secretary-General changing in 2016. I didn't know I was choosing a hugely historic year to be following her around.