You know, I think it has less to do with the GAAP vs UK standards than it does with how banks in general account for impairment. In my experience, they look at current/historic levels, and apply that to the future.
If I or you were doing it, we would IN ADDITION assess the likely level in view or economic factors and be conservative. I don't think that's what they do. So I agree with you that we should assume that the level will increase. I think a minimum conservative increase would be 50%.