Mr. Tom Costello:

In fairness, it works when the complexity and the full quantum of the work is fully anticipated. That is why the two-stage tender is international best practice. When a project of this complex nature is started without clarity and without a shared vision or shared input into its design, what happens once it has been worked on for four years - this happens all the time - is that the contractors seek to improve their situation through perceived gaps. The designers will never close all the gaps. What we have done here is that we have brought the contractors in early and they have worked together to close all the gaps. There is now certainty before we commit to the major part of the spend.