Scotland Bill

I am very grateful to the noble Lord for giving way; he has been very generous. One of my concerns following what he has just said is that we are going to be legislating in this Chamber on a wing and a prayer. I have taken Finance Bills through the other place. Changes to taxation have to be looked at meticulously because they have an impact on other parts of the taxation system. I can appreciate the difficulty that the Minister is in because of the commitments made by the leaders of the three parties, but I am extremely worried that we will end up taking decisions that we cannot back out of and that will have a negative effective not just on Scotland but on the whole of the United Kingdom. Can he give me any reassurance on this?