The hon. Gentleman, who has served in Government, will know that even within Government it is not enough to wish that institutions will behave in a certain way. We know that the incentives must be understood. For example, it is necessary to understand how schools will behave—the hon. Gentleman and I have experience of that. It is not enough for people to sign up in name to deliver a certain thing and for politicians to say that they will do it, because they will be moved by the complex sets of incentives in which they find themselves. If we do not understand how those incentives collectively impinge on those institutions, we will not truly understand how the institutions will behave. That is as true for education as it is for a bank.
It is not enough simply to say what we want and what should be aimed for; we have to understand how the framework of incentives for a private owner of the bank will lead them to behave in the way that Ministers and the rest of us want. I am impressed by the chief executive of the Green Investment Bank; I think he is passionate and honest in his belief about where the bank will go. Nevertheless, I want to understand how it will go there.