Why did the pollsters get it so wrong in the United Kingdom? How can this be?
The pollsters were not willing to accept the rise of identity politics. They could think only in conventional class terms of right vs. left, Conservative vs. Labor..
Scots voted for Scotland (the Scottish National Party).
English voted for England (the Conservative Party).
Diversity oriented Brits voted for a United Kingdom (Labour, Liberal Democrats). They were trounced.
Ethnicity is now the dominant factor in British politics. Get used to it.