My Lords, as an economist I am aware of the fallibility of economic forecasts. The Governor of the Bank of England had to admit recently that the forecast for the inflationary effect was 30 years out of date. We should be wary of placing too much reliance on economic forecasts as part of any impact assessment.
Of course, as the noble Baroness, Lady Chakrabarti, has just said, there must be some understanding of what the likely effect will be, based on international evidence and so forth. The Government have not gone into this totally blind. Nevertheless, we are talking here about a novel situation. We just do not know what is likely to happen as a result of a deterrent effect. We do not know what effect the Nationalities and Borders Act has had, and we do not know what effect this will have. We should therefore be a little guarded about the value and importance of an impact assessment in this case.