High Speed Rail (London-West Midlands) Bill

My Lords, I do not necessarily oppose the amendment, although I listened with interest to what my noble friend said about how this would save money. I am not sure what costings the noble Viscount has carried out. There has been some criticism of the costings so far as the whole project is concerned, yet we are told by the noble Viscount and my noble friend that this will actually save money. Perhaps, for the clarification of the Committee, they could tell us how their conclusions have been arrived at. I am no expert. My noble friend Lord Berkeley might tell me. I am not quite sure what a mined tunnel is and what differentiates a mined tunnel from a normal railway tunnel.