Welcome to BAOR in the 70's and 80's when everywhere was out of bounds.So, Grant Shapps has said that the NHS app is to be used as a Vaccination Passport.
COVID-19: NHS app to be used as coronavirus passport for international travel, Grant Shapps confirmsThe transport secretary tells Sky News he will soon set out details of which countries have made it on to a "green list".news.sky.com
Only one flaw for many of us on this site, it won't work for serving forces.
As I understand things, for serving personnel, you are registered with a Defence Medical Service Med Centre and your records are held on DMiCP.
The NHS app, even with your NHS Number, cannot reconcile you to a GP, you don't exist as DMiCP doesn't link in to the NHS.
Unless something else is worked out for serving personnel, we are stuffed, no entrance to anywhere that will want to know if you have been vaccinated or not.