European fuel exporters are selling petroleum products to Africa that have as much as five times the level of toxins legal in Europe. But countries like Nigeria have decided enough is enough.

A king, a farmer and a labourer - all kidnapped by gangs in a criminal enterprise that is rife in Nigeria. To tackle it in 2016, the governor of Lagos proposed that that the crime be made punishable by the death penalty. These three men told us what it was like to go through the ordeal.