We in Wales can now access a digital vaccination certificate. There is one for pilot events in England, and one for International Travel. Its a bit different to the England one, uses an online portal rather than the NHS England APP.
Its both simple and a bit of a faff... Have to upload official photo ID, then a photo of your face, then a video of you saying some numbers.
I applied about 9am this morning and my access came through just now. Feels good to have the digital certificate should I need it.
Link is here gov.wales/get-nhs-covid-pass-show-your-vaccination-status-travel