After seeing an article in the DM (helpful for a change! ), we decided to go on-line on the NHS website and order the paper version of the "Covid passes" for each of us. The digital version is downloadable via the NHS App.
The benefit of the paper one (apart from being aimed at the technological challenged like me ) is that you don't have to renew it every month. As I understand it, the digital one you have to tap into it every month to keep it valid.
Anyway, simple process to order the paper version, did it Monday, they said 5 days delivery, and they arrived today - two glossy A4 "certificates"!
Just thought I'd share it in case anyone else was wondering about them. Hopefully we'll never have to use it, but they're there if necessary ......