Regional branches of Zimbabwe's ruling Zanu-PF party have joined growing calls for President Robert Mugabe to resign. We hear the latest from the BBC's Fergal Keane.

Britain could put a tax on one-use plastic food packaging and polystyrene takeaway boxes. Government ministers are asking for evidence on whether a new tax would prevent waste and cut pollution in the world's oceans. Research this week found plastic is widespread in the stomachs of sea creatures, and humans are eating them. Craig Bennett, CEO of Friends of the Earth in the UK, tells us what he thinks of the UK government's proposal.

The US media giants Comcast and Verizon have expressed interest in buying parts of Twenty First Century Fox, less than two weeks after Disney tried to do the same. Steven Barnett, Professor of Communications at the University of Westminster in London, explains why there's a bidding frenzy in media land.

All this and more discussed with our guest throughout the show: Colin Peacock is the presenter of Mediawatch on Radio New Zealand. He joins us from Wellington.

(Photo: Zimbabwe President Robert Mugabe at a graduation ceremony in Harare on the 17th November, 2017. Credit: AFP.)