@DynamoKev
but windrush was caused by a lack of an ID card
No it wasn't. Windrush was caused by the Home Office's destruction of records and subsequent actions including lies.
An ID card might (or might not) have helped highlight the incompetence of the Home Office but there's nothing to suggest it would have prevented Windrush.
At least one of the Windrush victims had his passport confiscated - so no doubt the Home Office would have confiscated his ID card too.
Windrush was
exacerbated by the Home Office destruction of records and subsequent actions.
But the core problem was that there was no clear way to prove citizenship. Half the world, including AFAIK most if not all of continental Europe, has some kind of population registry and ID cards. Guess what? These systems are an UNDISPUTABLE record of your citizenship and, once your citizenship is recorded there, no amount of record destruction cockups and lies can take that away. I am no aware of countries with ID cards deporting their own citizens because they couldn't prove they were citizens - are you?
Ours is really an odd country.We are proud we don't have compulsory ID like those pesky Europeans, but are we sure that's the case? How does one prove citizenship without a non-compulsory passport? The truth is: it's incredibly harder, sometimes impossible.
Those born after 1981 are not automatically citizens just for being born in the UK.
So take the case of Mr A, British citizen because he was born in 1981 from foreign parents legally settled here (or whatever the legal term is).
Mr A's son, B, was born in 2001, and Mr B's son, C, in 2021, all in the UK.
Please explain to me how C proves he is a British citizen, if he doesn't have the records showing that A's parents, ie his great-grandparents, were legally settled in the UK when his grandfather was born.
Compulsory ID for voting is trickier. In the absence of a compulsory ID card, making ID compulsory for voting means restricting the vote of certain categories of people, typically the poorer ones who don't drive and don't travel abroad. That's why in the US Republicans are so keen on these restrictions.