Please note that the following information can also be found on GOV.UK (Demonstrating your COVID-19 vaccination status when travelling abroad)
You can access your covid-19 vaccination status through the free NHS App from the 17th May. You can access the app through mobile devices such as a smartphone or by tablet. Proof of your COVID-19 vaccination status will be shown within the NHS App. It is recommended that you register with this App before booking international travel.
If you do not have access to a smartphone and know that the country you are travelling to requires COVID-19 vaccination status, you can call the NHS helpline on 119 (From the 17th May) and ask for a letter to be posted to you. This must be at least 5 days after you’ve completed your course of the vaccine (received both vaccines). It is expected the letter will take up to 5 days to reach the individual.
Do not contact your GP surgery about your COVID-19 vaccination status. GPs cannot provide letters showing your COVID-19 vaccination status.