I'm not ignoring that Starmer got elected by keeping his mouth shut and his hands behind his back, but the Tories' smash-mouth politics did not win the day anyway. What I can see from where I am is that Brexit was a very special case and it's all gone back to normal now.
What happens is that Conservatives voters voted for someone else, mostly Reform UK. And the reasons have been the same as what's been festering since Brexit with the added factor that the Conservatives increased immigration to record level...
YMMV but I call a lead of 290 seats and 2,879,791 votes a landslide.
It was the Lib Dems that seem to have taken most of the Tories' voters: 72 seats (up 64) and 3,519,143 votes. The latter at least checks out. Reform was up 1 seat from 2019 for 5 seats total. Not quite a big splash then.
Labour also won big in Scotland against the SNP for the first time in years (but that was rather the fault of the SNP).
Data from wikipedia: https://en.wikipedia.org/wiki/2024_United_Kingdom_general_el...