UK isn't commandeering anything.

The UK government hasn't decided yet how digital ID will work, currently it's just a talking point. Probably it will be an app that you install, like the NHS app. Nobody is proposing that it be installed by default.

Apple separately announced that a Digital ID feature will be built into iOS[0] which the UK may use or not use.

> few who don't, so I'm curious what the plan is to bring them in line

They will be told by their employer to get it otherwise they will lose their job. Just the same as now, only at the moment you need a paper passport rather than a smartphone.

[0] https://www.apple.com/newsroom/2025/11/apple-introduces-digi...