In recent weeks the debate about Afghanistan has centred on the UK military’s tactics and resources. The bravery and commitment of our forces has been remarkable, and the toll of death and injury from recent operations heavy. But the result is 80,000 to 100,000 Afghans secure from Taliban threats and violence, and able to vote in the Afghan elections on August 20.

We committed to this mission for one reason: to deny al-Qaeda a base from which to attack the world. People support this and understand that in the 1990s the Taliban authority in Afghanistan provided a convenient incubator for al-Qaeda. But people now want to know whether and how we can succeed. We can. This is how.