As Iran defies the world by restarting its nuclear programme, Paul Kenyon travels to the Islamic Republic with UN nuclear inspectors, and gains exclusive behind-the-scene access to the International Atomic Energy Agency.
Iranian negotiators talk candidly about why they deceived the world over their nuclear programme for 18 years.
But it takes on a new complexion now we know that Iran later abandoned the diplomacy and chose to start enriching uranium again.
