I have sought to answer in correspondence some of the questions that the right hon. Member for Southampton, Itchen has asked, and I am happy to debate the technical points and to correspond further with him, because my colleagues should rightly have as much information as possible. That is how we intend to approach the debate. He said that the costings and calculations were not made available, but they have been made available-to him, his colleagues and the Institute for Fiscal Studies. The models are very complex ones that produce different outcomes depending on assumptions, and we are very happy to share them. We could have hidden them in a black box and pretended that the outcomes were true, but we have shared the assumptions and analysis and are happy to continue to do so.