I found the YouTube link posted upthread, very illuminating wrt polling.
1992 was the last GE when it wasn't accurate.
Even the Brexshit referendum was showing a leave win in the days preceeding the vote.
The issue in this GE, imo will be the quiet ashamed tories, the tories who stay at home, and how many racist tories switch to reform.
It's a toss-up here, sadly, but as ds said, we've done what we can.
Not many hours left of campaigning, thank God 🙏