I think you are mis-interpreting the message. Labour wants a general election sooner rather than later. Sunak resigning and forcing another Tory leadership farce would delay a general election by months, so they are not calling on him to resign but to call a general election.
My theory is that most of the hard core voters would have been out yesterday. Those who only vote in general elections will include a large number who subconsciously don't want to vote for losers. Unless there is some momentous shift over the coming months, I think we can see the way the wind is...
A source within Downing Street has just fed me a huge whopping lie, which I am going to repeat unqualified. I am obviously not going to declare my source, otherwise they will just pass on the next huge lie to another "respectable journalist". You mean knowledgeable in that kind of a way?