Mr Cameron entered power with a quietist foreign policy, a vaguely liberal take on criminal justice and an uncertain line on how to fight Islamic radicalisation at home.

ECONOMIST: Bagehot

However, unlike Ayatollah Khamenei in neighboring Iran, Sistani is a leader of the "quietist" school of Shiite thought, which believes that clerics should not directly participate in politics.

NPR: Sectarian Violence Erodes Sistani's Influence in Iraq