> Do I quit before the period expires? If you're fairly certain you'll be fired (and it sounds like you are) wouldn't this be the most sensible solution? When asked in interviews why you left saying you quit usually goes over a lot better than saying you were fired. And explaining why you quit would certainly not be considered a poor reason - at least not for the companies you would want to work for.
Companies really shouldn't pry any further when there's good reason to believe you're legally obliged to shut up. Plus refraining from the opportunity to rant about their dubious practises and coverups also implies that you're a sensible professional with high standards rather than a troublemaker.
The possibility that your most-likely-soon-to-be-ex-employer might feel compelled to offer you some kind of settlement in return for you agreeing not to mention alleged non-compliance or unfair dismissal to anybody else actually probably still exists. But you ask your counsel (or two or three different lawyers) about that, not HN.