https://www.reuters.com/article/us-britain-election-data-insight/fund-managers-deploy-machines-to-decipher-british-election-riddle-idUSKBN1Y70LD

Question: How do you predict the outcome of a snap election when so many polls have been so wrong, half of voters haven't made up their minds and the crucial factor may not be who wins, but how much they win by?