Parliamentary Voting System and Constituencies Bill

I have two questions about Clause 10. We have gone through several points on Clause 10, which changes the review dates. We have not referred to this but Clause 10(5) repeals Section 3(3) of the Parliamentary Constituencies Act 1986. As I understand it, it deprives the Boundary Commissions of being able to carry out interim reviews between general reviews. That would mean that the Boundary Commission could not do an interim review short of five years to deal, for example, with a significant change in population. What is the reason for repealing that power, which presumably would be of use in certain circumstances? Secondly and separately, the clause as I understand it does not change the basic structure of how the Boundary Commission operates, which is by producing reports at specified intervals. The reports then define what the new constituency boundaries are. What are the circumstances in which there can be a modification after the Boundary Commission has reported? How is that consistent with a process whereby representations can be made, on the basis of which a final report is issued? I know modifications can be made that can affect the report after it has been produced because this is referred to in the amended subsection (5).