More recently, and in relation to Syria, it was discovered that between 2004 and 2010, Britain had issued five licences for the export of sodium fluoride which can be used to make sarin, the most potent of nerve agents, used in the chemical weapons attacks in Syria in 2013. Further such licences were granted in 2012.
The measure of success in Northern Nigeria is whether civilians feel free from fear. Nigeria's sovereign government, with international partners lending their expertise, should be able not simply to clear the battlefield, but to satisfy the reasonable aspirations of the people to a secure and prosperous future. That could be a lesson for the rest of the world to learn.
The great hope is that they will return to their classes and spread the word. Hopefully those messages from Noor, Munira and Bushra, will eventually reach the very children preparing themselves to flee their loving, comfortable homes in Britain and head for a new life with Daesh. These Yazidi girls know the horrible truth of the fate that will befall anyone considering that move.