The *law* says that people must stay home. They are only permitted to leave home with a "reasonable excuse”. There are examples of how that is defined. But the law also says that you should remain in your local area. And that is not well defined. Probably because that's dependent on where you live. Local in Leeds is different to local in the High Peak. So there's a degree of interpretation involved. But there's still recourse to the concept of reasonableness.