Possible Clues:

• Sultanate on the island of Borneo
• Pacific sultanate
• Be about to lead one sultanate
• Book published that is about oil-rich area
• Sultanate — bishop's to manage one outside Europe
• Sultanate, British, and a French one
• 10K in Belgium leads to one in sultanate
• Sultanate of Borneo
• University of London reducing final figure for Commonwealth member
• Student leaves engineer for one in the Far East