I thank the right hon. Lady for what she said about the papers published yesterday. I thought she was being uncharacteristically unfair to the Government in her criticisms about not dealing with this earlier. A lot of official and ministerial time has been spent in the past 18 months examining some of these things. One problem that was identified, which still confronts us today and which we are talking to the European Commission about in the context of these discussions about alternative arrangements, is that we have to deal not only with the problem of the technology itself and making sure there is technology that is fit for purpose, but with the fact that, on the sort of model that has been discussed, we would need to see a significant number of derogations by the EU from its normal arrangements. So there are legal, and not just technical, problems that would have to be overcome.