National Policy Statement (Waste Water)

Like my right hon. Friend, I am concerned about the cost of the project. That is why my Department has instructed Ernst and Young to advise it in detail on the cost-benefit analyses that have been carried out to date, recognising, of course, that not far off a quarter of the estimated price is a contingency. It is important that throughout the process we are open about the figures that are arrived at. These matters concern not just his constituents and those of other London Members but 144 Members whose constituents pay Thames Water bills, of whom I am one. I can assure my right hon. Friend that, as I said in last week's debate, Ministers remain healthily sceptical about the cost of the project. We want to ensure that it provides value for money, and I am happy to tell him that cost-benefit analysis will be an ongoing process. I assure him that the alternatives that we have examined, which may be more attractive on the face of it, such as retrofitting sustainable urban drainage systems across London or separating clean water from dirty, cannot compare favourably with the cost of the tunnel. Indeed, one of the options that I have seen would come in at somewhere between three and four times the cost of the Thames tunnel scheme. I take the matter very seriously and will be happy to keep him informed of our progress.