Should the United Kingdom remain a member of the European Union or leave the European Union?
Remain 52% (+1)
Leave 48% (-1)
This is very reminiscent of the YouGov on-the-day poll for the indyref, which showed the tiniest of last-minute swings in favour of the status quo. The difference is, though, that Remain are on 52% compared to 54% for No two years ago, which leaves open the potential for a Leave victory if YouGov are just a little out. As it happens, they were a little out two years ago, but it was Yes that they overestimated by 1%. We'll see.
UPDATE : Ipsos-Mori's on-the-day phone poll looks more convincing for Remain -
Remain 54% (+2)
Leave 46% (-2)
So it does look like there's been a genuine late swing towards the status quo, albeit not a massive one. Leave can only really win now if there's been some kind of systemic problem with the public polls - although that's scarcely unheard of.
UPDATE II : To give a tiny glimmer of hope to Leave, it looks like the YouGov figures have flattered Remain slightly due to rounding - it's actually Remain 51.6%, Leave 48.4%.