With their pockets full of money from the multi-year surge in commodity prices as well as the mountain of foreign exchange reserves that Asian central banks have accumulated, sovereign wealth funds face a dilemma - what to do with all this money?

The sheer volumes of assets - even the smallest SWF, the Timor-Leste Petroleum Fund is above $1bn - and the speed with which they have grown - the East Timorese fund was set up just three years ago - means the agencies established to manage the funds have to look for external help.