In the final part of this series, Sir John Scarlett, the former head of Britain's Secret Intelligence Service talks about the interrogation of terrorist suspects and MI6's role in the run up to the war in Iraq.

The Philippines is one of the most dangerous places in the world to report from. More than thirty journalists were killed there in a single incident at the end of 2009. Kate McGeowan travels to the troubled southern island of Mindanao to meet one of the reporters whose job it is to cover the daily violence there.

How have advertisers and brand specialists convinced us to buy a commodity that is sold for a great deal more than it costs to produce? Louise Hidalgo looks at the exponential growth - and the cost - of the yoghurt industry.

In this two-part series, the BBC’s Paulo Cabral travels to the two places that marked Lula’s life – the poor region in the northeast where the president was born, and the industrial suburb of Sao Paulo where he made his reputation. What has been the legacy of one of the most popular politicians in Brazilian history?

The second part in this series describes what went on behind the Iron Curtain during the Cold War. Former MI6 Chief John Scarlett describes his clandestine meeting with an agent and the Russian defector Oleg Gordievsky talks about his reasons for coming over to the other side.

For Assignment Rob Walker travels to the city of Tijuana on Mexico's border with the United States on the trail of one of Mexico's most controversial law enforcement officers.

How have advertisers and brand specialists convinced us to buy a commodity that is sold for a great deal more than it costs to produce? Louise Hidalgo looks at the exponential growth - and the cost - of the breakfast cereal industry.

Many Turks have lost faith in their judges, who are seen as out of touch and too close to Ataturk's secular and military state. What will determine this struggle for power between the government and judges?

Britain's Secret Intelligence Service, marks its centenary this year and BBC security correspondent Gordon Corera talks to senior intelligence figures as well as their former arch enemies about the shadowy world of espionage.

How have advertisers and brand specialists convinced us to buy a commodity that is sold for a great deal more than it costs to produce? Louise Hidalgo looks at the exponential growth - and the costs - of the bottled water industry.