I can see, of course, where the confusion arises.
A Christmas fund is set up so that one can buy things for Christmas; a holiday fund is set up with the express aim of paying for a holiday; a pension fund for the provision of a pension. So it may have been a wee bit difficult for the Subway man to get his head around the idea that the purpose of an oil fund was not, in fact, set up with the express intention of one day purchasing oil.
You see, Iain, we already have oil. We've no need to buy it.
Bless him, his spell out of the front line hasn't really improved him any. Still Nicola is always ready to explain this sort of thing to slow pupils.
Norway's that long thin country up there, on the right hand side...