My Lords, I thank all noble Lords for their participation and contributions to the debate. I am minded to start with the comments of the noble Lord, Lord Snape. Certainly when he suggested that I should not be tempted by these amendments, I was reminded that we start proceedings in the House every day with the Lord’s Prayer, which says:
“Lead us not into temptation”.
I will fulfil that prayer’s requirements in my response this afternoon.
We have already touched, even this afternoon, on the cost of HS2. I say again to all noble Lords that the costs of HS2 have been the subject of intense analysis and review over several years, as we have already heard. As I indicated earlier this afternoon, we will continue to review costs for years to come. Let me once again praise the incredible work done collectively by the two Select Committees of both Houses. Let us put this into perspective: it is a combined period of two years of hearing evidence, considering all aspects of the proposed Bill, and on many occasions reviewing the costs for elements of the phase 1 scheme when asked to consider potential alternative options. It is sometimes suggested, and has been suggested again, that somehow there has not been an exhaustive
examination; I challenge that. The best way to do so is to read the detailed analysis, recommendations and reports of both Select Committees. I recommend that to all noble Lords who have not yet had the pleasure.
I thank the noble Lord, Lord Young of Norwood Green. As he noted in Committee, and as he has reminded us, the Select Committee considered all options that were presented for additional lengths of tunnelling in the Chilterns and in Wendover. It was not convinced of the need to recommend any further work on any of these options. As I have already said, these were exhaustive discussions, and I believe that that decision should be respected.
The Select Committees of both Houses also considered in detail the provision of additional environmental mitigation measures. It pains me to say it, but I disagree with my noble friend Lady Pidding that the Government have not published details of how certain things have been considered during the process of the Bill. It is worth noting, as I hope my noble friend will acknowledge, that many assurances have been given to the areas covered by the Chilterns area of outstanding natural beauty, including the provision of a £3 million fund for additional environmental mitigation measures.
My noble friend raised the issue of publishing tunnelling costs. The information used to assess the decision on whether it is appropriate to undertake a bore tunnel past Wendover and an extended bore tunnel through the Chilterns was published as part of the exhibits placed before both Select Committees that were used to establish the Government’s position regarding the decision not to provide any additional tunnelling. It was that information that the Select Committee—I refer to the Commons Select Committee here—used to recommend an extended tunnel in the Chilterns and an extension to the tunnel in Wendover. The exhibits included figures for several Chiltern tunnel options, which I mentioned in Committee. They range from £82 million to £485 million. The additional extension of 2.6 kilometres to the Chilterns tunnel, which I hope my noble friend acknowledges, was agreed following a specific recommendation from the Select Committee in the other place. That was at a cost of £47 million.
Turning to the costs more generally, an updated cost estimate for the project is published, as I said earlier this afternoon, at every iteration of the business case. I repeat that the next iteration is due for publication in the summer of 2017. The project as a whole, including its cost estimate and business case, is subject to regular independent review from the Infrastructure and Projects Authority—