I'm not too bothered about a vaccine passport as such for certain special situations to protect the most vulnerable. It is inevitable that you will need one for foreign travel. HOWEVER:
What bothers me is how the system works (an app for this?) and who this then passes the data on to (sale of your health information).
How you would deal with unvaccinated groups (children, those with particular medical issues who may have advice not to be vaccinated, your age, your nationality etc) and indirect discrimination on the basis of age, sex (pregnancy), disability or nationality.
How you go about preventing identity theft and ensuring that people are not lying.
The pub is not something I would consider a situation which should be considered a situation where you are protecting the most vulnerable like a care home (care home residents may lack capacity themselves and they have a human right to life which care home staff have a duty of care to uphold and carries greater responsiblity due to issues of it being their home and their other medical vulnerabilities which do not exist in a pub situation). It is reasonable to require all care home staff to be vaccinated for this reason.
Consent is based on the principle of free choice. Every obstacle you put in the way of normal life which coerces you be vaccinated even if you do not want to be, undermines the principle of consent. This is not ok.
I also have no idea how this would be policed. My suspicion is that regulars would generally get exemption from it all anyway. And that it would drive trade away. We go to the pub spontaneously. We don't make it a major organisational feat. Making us have tests whilst the rest of the older ones in the group can just turn up wouldn't work.
Also - how long do you think this scheme is going to set up? Its not something that can just be done instantly. And what happens if there is an autumn top up vaccination program? Do you only get in if you have the most up to date vaccine? If you don't, do you need a test anyway?
TBH I think the whole thing is unworkable in practice and its an idea being floated to look tough by politicians in the knowledge that it passes the responsibility to pub owners and off their shoulders. It also inflames the generational (and political) divide which conveniently just happens to fall right slap bang where the divide between group 9 and group 10 of the vaccination programme is. The Tory vote is significant in that it is mainly over 50....