Those you keep saying "but your stuff is stored and accessible by government already" keep missing an important point.
Yes, driving licence/passports/national insurance details etc. are indeed stored by government already. But it is actually quite difficult for another department to access them: it takes time, money, due process, and probably mountains of paperwork. In theory, the government probably can access an individual's bank accounts if they really want to, but they have to follow due process. Those safeguards exist for a good reason. The police can, in theory, seize anybody's computer, but they need a warrant to do so. The covid enquiry eventually forced Boris to surrender his Whatsapp messages, but he fought tooth and nail to try to prevent this (and guess who paid for it?). At the moment, it's fairly difficult for the government to "keep tabs on every individual, whatever they do, wherever they go". And I think that's how it should be.
Those safeguards are fragile. They only exist as long as the government "allows" them to exist. A future unscrupulous government could take them away with a stroke of the pen, manifesto or no manifesto. We saw how easily Boris prorogued Parliament, and how easily they declared lockdown, with no scrutiny. We've seen how easily Trump can dismantle the safeguards that make him accountable to anybody at all: tyrants around the world are watching with interest. We saw how easily the Canadian truckers had their bank accounts stopped. We saw how easily the government could suppress debate, and any anti-lockdown sentiment. While Starmer and digital ID's supporters might now be saying "digital ID is all for the greater good", it would make it much easier for a future tyrannical government to link everything together, especially if they abolished cash, and linked everybody's ID to their bank accounts.
I am not suggesting the above will happen, and as I said, those of us against digital ID are not helping our case by screaming "it definitely will happen". But what I think is dangerous is what might happen, what the government are not saying out loud. Starmer might have no intention of doing any of the above, but a future government might, and the infra-structure would already be in place. Democracy is an illusion, and in 2020, the mask not only slipped, but crashed to the floor and shattered. This was a warning to us all.
I like the fact that at the moment, all these things like passports, driving licences, bank accounts are somewhat fragmented, and separate.