UK - we're only permitted to go out if it's essential[0], such as buying food or collecting medicine. You're also permitted to travel to work, only if you have a job you can't do from home, and you work at one of the designated "essential" businesses/organisations. You're also allowed out for excercise.

The police here have in some cases been acting with ludicrous heavy-handedness, such as posting drone footage of 1-2 people walking over an empty moor, claiming they shouldn't because it's "NOT ESSENTIAL!". The actual laws actually seem quite reasonable, and leave room for common sense - hopefully the police will stop this nonsense, or their behaviour may cause people to lose respect and start flaunting the rules.

I believe it's the same situation across most/all of Europe now.

[0] https://www.gov.uk/coronavirus

The actual law is a little bit more permissive. https://www.legislation.gov.uk/uksi/2020/350/contents/made

This difference between the law and the government guidance seems to be causing a few teething troubles as police adjust to it.

Hah, I actually just updated my comment to make that kind of thing clearer, and see someone has already pointed it out ;)