awkward question arises how to show you are vaccinated. did the EU go through with a vaccine passport? last i read we'd abandoned the idea, no standard to conform to one reason.
Why is it awkward ? We already have it. The NHS app has all your vaccination details (date type) in it if you've registered, along with a simple button for sharing your vaccination details with any agencies that need to see it - this generates a QR code (that renews every 30 days) for scanning by those agencies. You can also get a pdf version, or have it emailed to you directly from the app.