Here's a tweet thread by a barrister about the law that came into force yesterday.
He makes these points
First things first
This is a "statutory instrument" not an Act of Parliament - it is so-called secondary legislation made under the Public Health (Control of Disease) Act
1984
This is legally significant
First, it means that the regulations can only be used for public health purposes, otherwise they are ultra vies the Act
Second, SIs (secondary instruments) can be challenged in court and quashed if they are ultra vires
This means that if the regulations persist longer than the public health emergency - or are not rationally connected to the threat faced - then a court can rule them unlawful
We now move to the regulations
First stop, regulation 3
This provides for the "emergency period"
This can end when the government decides the regulations are no longer needed, and this question needs to be reviewed at least every 21 days
There will be a review on 16 April
Now onto Regulation 12 - this is a long-stop date for expiry of 6 months for all the regulations
It goes on to talk about other things, but talk of Police States is a little premature, given the seriousness of the situation the country finds itself in - whether they got it wrong initially, we are where we are.