Constitutional Reform and Governance Bill

The Minister seems to be saying that this is now a principles-based Bill, as opposed to a rules-based Bill, but then the question is: what principle did the previous rule represent? The principle that the previous rule represented, it seems to me, was the principle that Ministers should respect the impartiality of the civil service. However, that principle is not in the Bill, and we have had to design a new clause to try to insert it. If that is not the principle that was involved, what principle was involved?