First Minister, in the absence of a clean air Act, as you've indicated, we are to have a clean air plan, once the consultation finishes and you respond to it and then put it into effect. Central to the new regime will be prevention and control regulations that apply best available techniques, or BAT, for pollution control. Perhaps you could elaborate on what this is likely to be, because I do think we need a mixture of ensuring that our major industries themselves improve their own practices, but obviously there's an enforcement regime that ensures, if they don't do it voluntarily, they will be brought to book.