Scotland Bill

I will give way to the hon. Gentleman in a moment. His party, in calculating Scotland's share of the United Kingdom's tax receipts, has used very different formulae and assumptions over the years. I do not have the exact figures to hand, but in the space of a few months it came up with a figure for Scotland's surplus, if that is what it was, which varied by several billion pounds because it used different assumptions in calculating Scottish tax receipts. That is the problem that we have in calculating the true relationship.