Muqtada belongs to the most famous religious family in Iraq, which is the al-Sadr family. He's really the third in line. [Muqtada's father] drew his power from the first really important al-Sadr, Muhammad Baqir, who was executed by Saddam in 1980, together with his sister. So it's really a family of martyrs, and that's why Muqtada suddenly emerged from nowhere with the fall of Saddam.

Turkey is saying that it wants to preserve Sunni dominance in Mosul. Obviously, there, the Kurds, the Shia, the Iraqi government have their own agendas.

Everything that happens in Iraq affects countries outside.

There are some things that could hold it together, notably oil revenues. But at the moment, the much vaunted surge has had a measure of success primarily, to my mind, because Sunni and Shia Iraqis hate and fear each other more these days than they hate and fear the Americans.

It's always sort of amazing, sitting in Baghdad, to watch visiting dignitaries being received in the Green Zone by politicians who have usually very little support and seldom go outside the Green Zone.

Mosul stands rally at a sort of juncture of sectarian and ethnic differences.

I don't think the whole of Iraq would be under al-Sadr, but I think he would be the predominant force on the Shia side. Quite contrary to his sort of maverick, firebrand image, he's shown a propensity to deal with the other side, to look for compromises, to negotiate. You might have a loose federation [in Iraq].