[Margaret Pilkington]

The issue with the app is that not everyone has a compatible phone...or wants a compatible phone (however cheap this might be)...I fit into the elderly category too....and I do not want a phone at all.
As for your justification of security....not all of us shop online.
My husband goes into the bank to deal with any financial issues...he needs only a four digit pin and sometimes he forgets that...but has no other signs of dementia (these PIN numbers are not important to him....and he has someone who will remember them for him...ME.....and you are going to tell me that this is a security risk too)

Getting this app requires phot ID....we do not all have current passports or photo driving licences....some of us have given up driving.
We have no plans to leave the country.....and if you are vaccinated then you have done what you can to protect yourself...so coming into contact with someone who is not vaccinated is no risk to you...unless you do not feel that the vaccine offers protection.
As for being tracked on here or on any sites that we use on the computer, it is different to having all your health records on a mobile device.....because I know nothing of the hackability of phones....are you totally sure that someone cannot access this information....well of course you are otherwise you would not have it...would you?
But because I am a cynical baggage I do not want that for me.