General Lord Richards - Chief of the Defence Staff, British Armed Forces (2010-13)

The US-led military operation against the Islamic State organisation has raised a host of awkward questions. Is the makeshift coalition fighting a war, or mounting an anti-terror operation? What will victory look like, and how long will it take? HARDtalk speaks to General Lord Richards, who recently retired as Britain's top military chief. He has led military operations in Afghanistan, Iraq and Sierra Leone. What does he make of this latest one?