Constitutional Reform and Governance Bill

Because there would be circumstances in which one would want to return to such an issue. It will be a political judgment for the Government. They may decide "No, it's clearly dead; we'll have to leave it," but in other circumstances they may believe that it is in the interest of national security, or whatever, to return to the issue and try to make the argument again. The key point is that the Government would not be able to proceed without the House of Commons having either voted in favour or decided to let the matter rest.