If it becomes more and more inevitable that Labour will win the election then it'd be interesting to see just how far the Tory vote will drop. The panic over Corbyn or Brexit getting mothballed was enough for the Tory base to come out in 2019, why would anyone vote for them at the next election, particularly if it's inevitable they'll lose? They've lost the centre/centre right (trying to win it back with gimmicks like bringing Dave back) and fucking Braverman off and failing at everything will only see them lose the headbangers on the right. The red wall is pretty much lost (their vote was mostly for Brexit in 2019), so who are they actually appealing to now? If it's just the top few percent of earners then by definition that's a small base. The middle classes have also been hit hard by the COL crisis.
Reform are polling well but usually it gets to an election and the right pretty much all mobilise behind the Tory Party (in a way the left/liberal/centre don't do behind Labour). I think the vast majority of their seats are up for grabs, particularly if tactical voting comes into play. Dorries lost her seat despite Labour and Lib Dems not backing down but in a general election you can't afford them to split the anti-Tory vote like that.
As catastrophic as 2019 was for Labour they still got 40% of the vote and 202 seats. The Tories could conceivably get nearer half that and from the position of a big majority now (Labour were already in opppsition).