What are the barriers, in both attitudes and in practical terms that prevent more women from going into politics? The picture is complicated. On one hand, politics is changing - with our Prime Minister about to take back control of the country after giving birth to her first child. On the other - just this morning there's news of misogynistic slurs on Australia 's first female Prime Minister Julia Gillard who's long talked about her struggles with sexism in parliament. My guest is Professor Sarah Childs from Birkbeck College at the University in London who has studied this area and is in New Zealand to give a lecture about Theresa May's premiership - rising to the top job after the Brexit referendum.