As in every ballot, the same percentage will vote as they always do, which makes the totally disenfranchised as "king-makers", if they say fuckit then a hung parliament is very likely. That's a "Known unknown". Random polls clung to by all sides hoping to boost their chances, might make a trivial difference....but no knockout blow. As the referendum proved beyond all shadow of doubt, the influence of the massed ranks of the media is the biggest factor at play in the world of the uncommitted. The racism card won the referendum, just as the pension bombshell lost May her majority.
Austerity, and it's continuation/acceleration will be airbrushed away, the travesty of universal credit( or poverty to be more accurate) will be portrayed as a great success for it's victims, it already is in the msm. A reprise of the brexit illusion of "unicorns/sunny up-lands and no foreigners " is jockeying with " Trump to the rescue" as the core market headliners for the brexitory party strategists . The less Labour say the better, let murdoch and friends carry on making up lies, some voters have wised-up , not nearly enough but every little helps in the fight for democracy( actual democracy not a kangaroo version like the referendum fiasco when only one side took the stand, and lied lied and lied again)