People change their minds. Particularly when they are in possession of more, better quality, facts. Every five years (at a maximum) UK voters are given an opportunity to express their changed opinions at the ballot box.

In this case there is a deadline coming up. (October) Because of this people should be given the opportunity to confirm, or revoke, their previous votes. This is much more important than a parliamentary vote as this is a one-off. Speak now or forever hold your piece.

For Brexiters and remainers alike it would be a confirmation of the people's will.