Because the critical thing we must do is stop the disease spreading between households.
That is why people will only be allowed to leave their home for the following very limited purposes:
- Shopping for basic necessities, as infrequently as possible
- One form of exercise a day - for example a run, walk, or cycle - alone or with members of your household
- Any medical need, to provide care or to help a vulnerable person
Travelling to and from work, but only where this is absolutely necessary and cannot be done from home.
That's all - these are the only reasons you should leave your home.