I’ve just been looking at the on-going polls on Brexit regret, and basically you’re seeing the usual Know-Nothing 27% still fully supporting Brexit and another 23% willing to go along (but half of them worried the Tories will cock it up). The other 50% or so thinks it’s a bad idea, and that number continues to increase with each poll.
But, yeah, polls. With hard election results like the ones you’re talking about, perhaps a lot of respondents are just lying.