As others have said, the genesis of the clause lies in the report of the Smith commission. I have supported the commission since the day, indeed the hour, when it reported, but we cannot ignore the fact that the process was undertaken at great speed. Necessarily, given that five parties were engaged in the process, it involved a degree of compromise all round. It is for that reason that all of us undertook to ensure that there would be consultation following the publication of the report and, subsequently, the draft clauses.
In a debate in which consensus is not always easy to come by, I am pleased to note that there is consensus on the fact that the clause is a faithful replication of the agreement that was reached under the chairmanship of Lord Smith. However, the consultation that has been conducted since the publication of the draft clauses at the end of January has highlighted, and generated, a substantial number of important matters, some of which are technical and some of which go to the heart of the issue of taxation itself.
I suggest to the Secretary of State that further consideration may be necessary. He has the ability, through the good office that he holds, to bring all the parties together again to consider the representations that have been made during the consultation, and to consider whether, given the complexities and possible areas of conflict that could arise, it is actually worth implementing the tax power in the way that is currently envisaged. If the consultation is to be carried out in good faith—and, for my part, it always has been—there are sufficient matters about which we should be talking. That would still allow us—if it were necessary, and if it were possible to construct a consensus—to return to the issues on Report.