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That is actually the kind of complex flow of voting behaviour we've been modelling in https://www.tactical2017.com/
UKIP is majority Tory, but it has been a vehicle for some Labour and Lib Dem voters to move to the Tories.
This is more visible in the Northern seats in which Leave was a dominant force in the referendum (those areas where Leave represented more than 60% of the vote).
Different rules seem to apply where Remain achieved 60%+ of the vote.
Also worth mentioning that in those strong Leave seats... all London-centric ideas seem to break down. It's comparable to quantum physics, everything we know suddenly doesn't make sense and certain things seem unknowable :)
Here's one:
From this New Statesman article (on 5th May), and evidently sourced from YouGov.
I think I might have also seen some analysis by LSE or people like that.
Edit: I have found the YouGov source.