nhs.uk/get-tested or call 119 to order a pack. They’re also available at some pharmacies: first visit gov.uk/get-collect-code to get a code that you will need to show when you collect them.
You may also wish to consider taking a test if you’re likely to be in a higher-risk situation that day – for example, mixing in a crowded indoor space such as a nightclub, or visiting vulnerable people.
Doing a test will reassure you that you are unlikely to be infectious with Covid-19. If you do test positive, you can take action to help stop the virus spreading.