How many policy decisions do lobbyists affect? After launching an investigation into lobbying activities in Australia, government accountability reporter Christopher Knaus joins political editor Katharine Murphy to talk about why it’s alarming that we know so little about lobbyists activity in Australia. Why doesn’t the lobbyists register capture everyone seeking to shape political decisions? Is the code of conduct lobbyists are meant to follow ineffective?

• The Transparency Project is supported by the Susan McKinnon Foundation through the Guardian Civic Journalism Trust

How to listen to podcasts: everything you need to know