The British military pull out from Afghanistan will soon be completed. Digesting the painful lessons from a 12 year deployment will take a whole lot longer. HARDtalk speaks to Richard Streatfeild, a former infantry officer in Helmand during some of the toughest fighting with the Taliban. Back then he kept an upbeat audio diary of life on the frontline; now he takes a more jaundiced view of Britain's Afghan commitment. Is it time to acknowledge failure?