Re: Windrush & Co.:
I'm talking about the Scottish National Entitlement Card (see: https://en.wikipedia.org/wiki/Scottish_National_Entitlement_Card) which, while voluntary, entitles holders, e.g. pensioners, to free use of some services such as bus transport. There are fears that it will over time effectively become a (form of) ID card in that some or many services will be unavailable without it. All Scots are also assigned a Unique Citizen Reference Number (UCRN) which is linked to the Card. (See same link.)
The Republic of Ireland has recently introduced a Public Services Card which, while voluntary, is required if one wishes to obtain a driving licence and a passport. (I am not talking about the Irish passport card which is an adjunct to the Irish passport and is genuinely voluntary.)
Northern Ireland has had a Northern Ireland Voter’s Card since (I think) about the 1980s but I stand to be corrected on that date/period. Unsurprisingly, this card does not appear to be controversial.