The very vague answer is that anyone can challenge any legislation at any time; the chances of success are a different question.
Implementing legislation for treaties, as I've described before, is usually fairly straightforward. We've seen a lot of these kinds of standard provisions in this same bill, but otherwise they don't normally get into more detail about what would be included in the treaty because, oftentimes, the treaty that is being implemented by a particular statute has already been drafted and signed by the time that implementing bill comes before Parliament. It's a tough question to answer, in that this is a bit of a different process from what we've sometimes seen before with implementing statutes for treaties.