Social Action, Responsibility and Heroism Bill

My Lords, I am preoccupied by what the Minister said earlier: that the effect of the Bill, essentially, would be to cut through a morass of various decisions in the common law and, thereby, clarify the situation for the assistance of the judge. I think I have paraphrased what he said reasonably well. Could the Minister deal with a technical point? Is there not a presumption in our law that the common law will be changed by statute only where statute makes it clear, beyond peradventure of doubt, that it is changing the common law? In other words, what common law is being changed by this particular clause that was not already dealt with by the 2006 Act? In other words, what specific common law, now extant, is being changed, if at all? If not, can there be any validity to the clause at all?