https://www.gov.uk/guidance/tier-4-stay-at-home#hands-face-space
If you live in Tier 4 you must not leave or be outside of your home or garden except where you have a ‘reasonable excuse’. A reasonable excuse includes:
You can leave home for work purposes, where your place of work remains open and where you cannot work from home, including if your job involves working in other people’s homes. You can also leave home to provide voluntary or charitable services.
You can leave home to buy things at shops or obtain services from a business which is permitted to open in your Tier 4 area, but you should stay local. For instance you can leave home to buy food or medicine, or to collect any items – including food or drink – ordered through click-and-collect or as a takeaway, to obtain or deposit money (for example, from a bank or post office), or to access critical public services (see section below). You may also leave your home to do these things on behalf of a disabled or vulnerable person.
You may also leave home to fulfil legal obligations, or to carry out activities related to buying, selling, letting or renting a residential property, or where it is reasonably necessary for voting in an election or referendum.
You can leave home for education related to the formal curriculum or training, registered childcare, under-18 sport and physical activity, and supervised activities for children that are necessary to allow parents/carers to work, seek work, or undertake education or training. Parents can still take their children to school, and people can continue existing arrangements for contact between parents and children where they live apart. This includes childcare bubbles.
1 in 3 people who have coronavirus have no symptoms and will be spreading it without realising it.
You can leave home to visit people in your support bubble, or to provide informal childcare for children aged 13 and under as part of a childcare bubble, to provide care for disabled or vulnerable people, to provide emergency assistance, attend a support group (of up to 15 people), or for respite care where that care is being provided to a vulnerable person or a person with a disability, or is a short break in respect of a looked after child.
People can also exercise outdoors or visit some public outdoor places, such as parks, the countryside accessible to the public, public gardens or outdoor sports facilities. You can continue to do unlimited exercise alone, or in a public outdoor place with your household, support bubble, or with one other person if you maintain social distancing. You should follow the guidance on meeting others safely.
You can leave home for a medical reason, including to get a COVID-19 test, for medical appointments and emergencies, to be with someone who is giving birth, to avoid injury or illness or to escape risk of harm (such as domestic abuse),or for animal welfare reasons – such as to attend veterinary services for advice or treatment.
You can also leave home to visit someone who is dying or someone in a care home (if permitted under care home guidance), hospice, or hospital, or to accompany them to a medical appointment.
If you are planning to visit, or accompany someone to, a care home, hospice, hospital or other healthcare setting, you should check that this is permitted by the facility.
You can leave home to attend or visit:
However, weddings, funerals and religious, belief-based or commemorative events linked to someone’s death are all subject to limits on the numbers that can attend (see below).
In general, you must not meet socially or carry out any activities with another person. However, you can exercise or meet in a public outdoor place with people you live with, your support bubble (or as part of a childcare bubble), or with one other person.
You should minimise time spent outside your home. When around other people, stay 2 metres apart from anyone not in your household – meaning the people you live with – or your support bubble. Where this is not possible, stay 1 metre apart with extra precautions (for example, wearing a face covering).
You must not meet socially indoors with family or friends unless they are part of your household or support bubble.
You can exercise or visit a public outdoor place:
Children under 5, and up to 2 carers for a person with a disability who needs continuous care are not counted towards the outdoors gatherings limit.
Public outdoor places include:
You cannot meet people in a private garden, unless you live with them or have formed a support bubble with them.
You must wear a face covering in many indoor settings, such as shops or places of worship where these remain open, and on public transport, unless you are exempt. This is the law. Read guidance on face coverings.