What’s worse I find is self-checkout’s (at least in the UK) require a member of staff to clear your failed payment. Like, there’s no reason it couldn’t just go back to “Try again”, instead the light goes red, the single person who has already approved your over 18 purchases, your brought your own bag alert, etc. has to come back on their route of 40 self checkouts to check that you have in-fact not got enough money on your card, and then to stand next to you (or worse, bugger off to someone else) for you to try again or use a different card. Argh.
There’s a bit of nuance here. Mad cow disease (BSE) was a big deal, yes, but vCJD (the human form) was not prevalent - as of a few years ago, I think there was less than 200 cases in the UK, and less than 250 cases worldwide - ever. As it can be dormant for decades they believe, it’s why the UK population and visitors at those times is not allowed. Keep in mind, in the UK we do still donate blood - we don’t have to import it from elsewhere. But as it’s such a horrific disease, it’s easier to just say “No one from the UK can donate blood.” it’s not like it would impact other countries blood supplies, and keeps them a bit safer.