The problem with the UK polls, apart from the usual unreliability etc is the fact that just like in the US the popular vote is of no importance. It is first past the post in 632 constituencies. YouGov in their latest poll found the predicted outcome to be Conservatives 339 seats (43% of the vote) and Labour 231 seats (34%).
This would give Cons an absolute majority of 39 seats (and Labour far far from any majority). However, the statistical range for the Cons is 367 to 311. The lower bound would cause a hung Parliament. Still the likelihood is a Tory win (despite the latest Telegraph poll). But there are still “remainers” among the Conservatives which would mean that Boris Johnson would need a large majority to ensure a “Brexit”.
650 constituencies, not 632. 326 Seats needed for a majority.