What choice do these voters realistically have but to allow it? What alternative is there? As a minimum they would need to be able to put their votes somewhere

What choice do these voters realistically have but to allow it? What alternative is there? As a minimum they would need to be able to put their votes somewhere that would somehow "disallow it", but where would that be? As for extra-parliamentary measures, I believe most of these are illegal and the rest of symbolical value only. Added: I feel sorry for those in the UK. Other former wealthy and admirable European countries seem to be on the exact same path of decline, too. I'm sure it's not due to Brexit at all; OTOH I have a feeling that I can't really explain rationally (ie. this comment box is too small) that Brexit will somehow be good for the UK on average once the transition pain is over and done with. That might be a while, though This situation is not new, it's been a slow decline ever since Maggie and most likely long before that.