Sarah Hayward: I can see that, but—again, I am not an immigration specialist—under that proposal, would the train not stop anywhere else, or do you need immigration controls at every station at which it stops between Birmingham and St Pancras? There are plenty of other cities in the world that have high-speed rail where people interchange at different stations to go to different locations in the country. Again, High Speed 2 and the Department for Transport have not considered other options. They have not considered tunnelling under Camden, they have not considered walking between the two stations and they have not considered the differential impact. We do not think that the viaduct is viable or that there is a business case for it.