-
Votes are private so no one can ever really know. It's all guesswork.
Found some polling which suggests about 14% of Con voters planned to switch to Lab and Con voters were about 12% less likely to be certain to vote compared to Labour. There might be other polls. https://www.survation.com/labour-set-to-win-in-wakefield-by-election/
He's probably wrong that no voters switched and it was just Tories not turning out. Would need to see more convincing polling. Either way if more than half your voters don't turn out I'm not sure you can just win them back overnight
Why would he resign, he has a mandate from the British people?
Turns out they didn't bother to go and exercise it last night though
https://twitter.com/DavidGHFrost/status/1540218121943916550