It's that Reform vote that is growing. The Conservative Party is being eaten from left and right.
They absolutely did this to themselves. They will never be right wing enough for Reform and the centre voters are repulsed by racism, incompetence and financial foolishness.
They will only recover once they have regained their middle Tory middle England voters who are repulsed by them. It says so much that they would rather stay at home or vote Labour. They sold themselves for some voters in the North. It has been a mistake as these voters are extremely fickle and they have lost their middle England base.
In another world the Conservatives would make Boris Johnson persona non grata for effectively making them the thicko party rather than Labour. Alas they are now equally dim and so this is not possible now