You will need to follow the below advice issued by public health England:

To avoid spreading infection:

If you live alone, do not leave your home for 7 days
Do not leave your home for 7 days from when your symptoms started, however mild they are.
If your temperature is still high after 7 days, stay at home until it’s back to normal.
If you live with other people, keep everyone at home for 14 days
The 14-day period starts from the day when the first person in the house became ill.
It is likely that people living within a household will infect each other or be infected already. Staying at home for 14 days will greatly reduce the spread of infection to others in the community.