[quote Rainbowsew]@ChequerBoard what's the NHS app that proves you have the jab? I only have the card they gave me at the appointment.[/quote]
It's the NHS App. It existed pre Covid and does other things too - you can request repeat prescriptions etc via the app and it has been extended to provide the NHS Covid Pass.
You will need to register for the App and follow the NHS Login procedure to prove your identify the first time you log in which can take up to 24 hours to process m. After that it's password and/or face recognition protected.
https://www.nhs.uk/nhs-app/