Andrew Marr with the former UN deputy secretary-general Mark Malloch-Brown, who argues that national governments are no longer equipped to address complex international issues. The Conservative MP Daniel Kawczynski describes the "corrupt grandiosity" of the Libyan leader Colonel Gaddafi, and explains what is meant by the government's 'principled engagement' with the country. The historian David Gilmour looks back a hundred and fifty years to the unification of Italy, and considers whether it has ever really become a coherent nation-state. And the human rights lawyer, Baroness Helena Kennedy, believes we need to be more judgemental if we are to live an ethical life.

Producer: Katy Hickman.