Dissolution and Calling of Parliament Bill

In which case, one could conceive of a situation in which the Government were aware of something coming up that the public were not aware of—a report or a major security breach that had not yet been made public, for example. Or, for instance, the Government might choose to hold a general election before boundary changes because they thought that it might be to their advantage. Would it not make far more sense for the House simply to be able to vote at that moment?