Polls - are these a straight % of vote or are they actually forecasting numbers of MPs
Polls which show voting intention I think, now has Labour behind
But this petition and polls are more about dissatisfaction with Labour over much else
I recall one line from the US analysis that no incumbent had been re elected with disapproval at a certain rate, 70% without looking it up. That held out. People get voted out when they are doing badly
As for a GE now I think it's better to wait for a while. Rn public sector and benefits will be pro Labour and I can see that becoming more difficult as private sector shrinking reduces spending.