Ms Rosemary Collier:

The initial designs around levels were done before the installation of the shelter. Then archaeology work and digging out was done when the shelter was being installed and I think there were some changes to how levels needed to sit to make sure there was the right falls and there would not be any slips and trips. It was due to a health and safety assessment that is done at the end of the installation and it required a variation on the contract. That is how it works.