That is a good point, I hadn't thought about it like that. However the requirements to register to vote in the UK are pretty lax as well - to go on the electora

That is a good point, I hadn't thought about it like that. However the requirements to register to vote in the UK are pretty lax as well - to go on the electoral roll you tell the government your name and address, and you pinky promise that you're telling the truth. They then mail you polling cards for any election, which you don't need to use. You don't need to give them any national insurance numbers or other ID to do this. It literally amounts to "I'm Joe Bloggs and I live at 20 Smith Street". That seems like the bare minimum required to have a voting system to me.