For the full details of the legislation on the public heath protection ( coronavirus) legislation you need to read the House of Commons human rights committee report of 08 April.
You May be ( or may not be ) surprised that Most of the so called rules are not laws or even rules and as usual the elf & safety types and little Hitlers of our society are creaming their pants at the chance of enforcing all sorts of rules they have invented.
the Isle of Man is not part of the UK and so has its own laws and due to the small health system has locked down hard, I needed to collect an aircraft from the IOM and this required government approval and adherence to some very strict laws ( not rules !).