3/6. In San Francisco's opera house exactly 60 years ago the United Nations was founded. Led by the victorious Second World War Allies, 50 countries met to set up an organisation which it was hoped would prevent the great wars of the past century. Do failures in Rwanda, Srebrenica and Iraq suggest the institution is no longer able to cope with the conflicts of the world? Gavin Esler explores the past ana futureof the UN. Producer Elaine Thomas Shortened repeat at 9.30pm