Taken from the previous post.
"People in Wales cannot use the NHS app to get their NHS COVID Pass and vaccination status.
You can get your vaccination status in paper format if 2 weeks have passed since you completed a full course of the COVID-19 vaccine."
Looks like we'll have to make do with the paper document for the time being.
All works fine for those of us lucky enough to live West of the border, but via NHS website not the NHS app:
Post in thread 'Vaccination certificate'
https://www.motorhomefun.co.uk/forum/threads/vaccination-certificate.246844/post-4639963