Let me just develop my argument first, if I may. It is therefore a curious affair that we should expect our own negotiating side to lay out in great detail what our own negotiating position should be. I tried to find precedents in our negotiating history, and I did some analysis of negotiations in which I was involved in the later stages. Those were the negotiations leading to the joint declaration on the future of Hong Kong in the early 1980s. Some Members will remember that there was considerable concern at the time about the economic future of Hong Kong under the sovereignty of communist China, and therefore about confidence-above all, economic confidence-in the territory. Were any economic analyses of the different scenarios published? No; not least because, had they been published, all of them would surely, at that time, have made the assumption that any change in the existing arrangements would have been negative to the economy of Hong Kong, and therefore probably to the UK as well. In fact, today-20 years after the handover-whatever our concerns might be about the commitment to some of the freedoms guaranteed under the joint declaration, Hong Kong has surely made significant economic progress. My point is that any analysis at that time would have been done on the consensus assumptions of the early 1980s, which would have been substantially wrong and, if published, would almost certainly have been an impediment to the sensible, pragmatic, diplomatic negotiating compromise that was then achieved to everybody's benefit. In the same way today, the range of assumptions behind trying to calculate which future road in the negotiations will be most economically beneficial makes that almost impossible to calculate, so let me give a few examples of the sort of questions that would have to be considered. The latest statistics show that our current trade is 43% with the EU and 57% with the rest of the world. If our relationship with the EU did not change-if we were not leaving the EU-what would those figures be in five or 10 years' time? The figure for EU trade has declined, but would that continue or reverse? Would the strong predictions for growth in Asia prove optimistic and accurate or would they underestimate what will happen? Right now, we are exporting more goods than services, which was unimaginable five years ago, but will that continue? How would different trends in goods and services affect our future trade across the world? Which countries would we benefit more from trading with if our goods were doing better than our services or vice versa? When we leave the EU, with whom will we reach free trade agreements? FTAs are just one of the tools available to us, so what other trading arrangements will we set up? How long will each of those agreements take, and what will their economic impact be? Looking at south-east Asia-the area where I work for the Prime Minister-if we want to, will we be able to move on individual free trade agreements faster than the current progress of the EU? What about the US-the biggest of them all? We know that the US executes 25% of its trade with the European Union with the UK alone and that 50% of its financial services trade is with the UK. Its interest in having a separate FTA with us will largely depend on the degree to which we offer something different or the degree to which we converge, have equivalence or have mutual recognition of the regulations and laws in the EU. Given what I have just outlined, how can we possibly know the economic impacts of various aspects of future potential scenarios with the EU?