A BBC Trust review into the corporation's news and current affairs output says t it needs to do more to make an impact. The report found that audiences looking for quality investigative journalism rated Channel 4 higher than the BBC. It also said that on and off screen diversity needs to be addressed. In his first interview for the Media Show, James Harding, head of BBC News, sets out how he's going to improve coverage. Also in the studio; Richard Sambrook former director of Global News and the BBC and Stewart Purvis, non-executive director of Channel Four and former editor in Chief at ITN, discuss how improvements might be made at a time when money needs to be saved. Lachlan Murdoch, son of Rupert, has been appointed non-executive co-chairman of both entertainment company 21st Century Fox and global newspaper company News Corp, alongside his father. He's finally been persuaded to rejoin the family business, and now looks set to be the heir to his father's empire. Richard Aedy, Presenter of The Media Report on ABC Radio National in Sydney, Australia - where Lachlan has been based - tells Steve Hewlett what's being made of the appointments back in the Murdochs' home country.Producer: Katy Takatsuki.