In practical terms it means:
- Go home, and stay at home, avoiding contact with other people
- Do not go to work, school or public areas
- Do not use public transport (including taxis)
- Avoid visitors to your home
- Ask friends, family members or delivery services to carry out errands for you – such as getting groceries, medications or other shopping
- Do not go to the GP/attend hospital without ringing in advance
There is more detailed advice here: www.gov.uk/advice-sheet-home-isolation.