The post referendum high, the realisation that Labour MP's are trash and the long term downfall of Tories until 2017 led to the unprecedented 56 MP grab, it won't be happening again. But Labour are probably going to relose a lot of their seats next time (for still being useless as the Corbyn fever dies), along with the Tories potentially losing a few (hopefully that smug looking useless **** member for Aberdeen South...) off the back of Westminster looking particularly sad atm.
Again, has nothing to do with policies as no one cares anymore about the country it would appear, just hurting the "other team".