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There wasn't an EU Referendum Exit poll, so slightly different kettle of fish really.
I am not sure how seriously to take this one... yet. But as far as I can see, the margin of error will still keep May from having any kind of increased majority, at least. Maybe she'll scrap 330 seats or so and keep current majority, rendering the entire election a waste of time. Unlikely, but not impossible yet, for this poll to be wildly wrong after all.
Either way, this election night is going to be a lot more interesting than I'd thought.