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Or if they know it's close, then it might spur them on to vote for their desired result...

Yeah I agree. I don't see how withholding information here leads to a fairer outcome.

It's pretty obvious they don't want to affect the outcome of the election... Exit polling isn't super accurate to begin with, it's better for everyone if the data isn't announced until after the polls close.

If a specific 400 people had changed their mind in 2017 there would be a tory majority government rather than a minority with dup backing

If a specific 800 people had changed their mind the tories wouldn't have been able to form a government even with DUP support

However the exit poll in 2017 was pretty much dead on

Extensive research has been done in this very subject, case you are interested in knowing more.

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