There is not time for teaching on air quality, but can I make a couple of points to see if you agree with them. The issue here is not about complying with EU regulations. The issue here is about the health of the air that London breathes. The background pollution that you keep stressing is not the unhealthy bit, it is the places where it is concentrated and prolonged that is the problem, which is why the correct approach is to target measures in central London and to take the restrictions off, if we can, in outer London where the problem is not acute. That is what we should be doing, that is what your air strategy says you are doing and I hope that when you come back you will come back with an open mind instead of ruling out what you have put in your air strategy for something that is worth looking at. The question I want you to focus on, however, is the suggestion that for a temporary period next summer, during the Olympics and the Queen's Diamond Jubilee, there should be put in place restrictions to get the level of pollution down. That is good for Londoners, good for the Olympics and may well save us the possibility of financial penalties through breaching the promises that you have given to the Olympic authorities. Will you consider a temporary, short-term, limited zone for central London for next summer?