I thank the Minister for that serious answer. He has answered my questions in the spirit in which they were asked last week.

On the issue of the polycyclic aromatic hydrocarbons, is he prepared to give me the evidence of Sir Donald Acheson that short-term exposure may not have deleterious effects? I will not challenge the chief medical officer on his own ground but I should be more than curious to ascertain what evidence the Minister is relying on.