You can access your COVID-19 vaccination status through the free NHS App from today.
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 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. We expect the letter to take up to 5 days to reach you.
Do not contact your GP surgery about your COVID-19 vaccination status. GPs cannot provide letters showing your COVID-19 vaccination status.
Full information at: https://www.gov.uk/guidance/demonstrating-your-covid-19-vaccination-status-when-travelling-abroad