The point
@11101 made about what happened in Italy is worth baring in mind. The UK has literally followed exactly the same path but slightly earlier. So Italy initially allowed work to that degree then moved to essential work only. My personal thoughts are we will move to that model and when the legislation is through we will see it.
I would be telling anyone who isn't an essential worker to start making plans without work as it's coming and it's better to be prepared than simply thinking it will all be okay only to be told you're not going in to work the next day.