I want to have a government pass a permit law without the public knowledge overnight. The story is set in the United Kingdom, where half the population are cat people. The recently elected government are extremely racist towards cat people, and want to make their lives as difficult as possible. I currently have a scene where a law is passed overnight or secretly that prevents the cat people from going outside without a permit. The idea of having this done overnight is that as many people as possible will be caught outside without a permit, so they are given a criminal record and fined or imprisoned depending on if they can pay the £100 spot fine. This way the government could reap massive amounts of money from people caught outside by police forces without a permit, simply because they didn't know.
I have been looking at the UK law making process, and I can't see anything anywhere that explicitly states that the population will be made aware of a law that is being created. However, I am worried that the situation may come across as implausible, unless laws have been passed quietly in the past. So, is it possible that the permit law could be pushed through without any public knowledge, and if so how?
Edit based on comments (from comment)
I decided to have it that humans elect the government for one election cycle and cat people for the other so that I can bypass having to explain lack of opposition (handwavium ;) ) Also, if someone does get a permit, then they can still work obviously. A lot of these things I hadn't considered, looking back, so I will probably need to change percentages