On a lot of the threads I've been reading about the election it seems that people have accepted a universal truth that Reform voters will be those who would have voted Conservative in this election otherwise. That this will then split the Tory vote leading to Labour having a greater majority. I think this is somewhat dangerous thinking. It's important that a Labour majority is not assumed if that's the party you (out of no alternative or not) want to be in govt.
Reform will likely appeal to the disenfranchised on two different ends of the spectrum;
The old (wealthy and non-wealthy) make Britain great again types (traditional Tory voters and Brexit voters). Newspapers have been telling them for years that immigrants are destroying the sun filled Britain they used to know.
The young of poorer backgrounds who feel mainstream parties do not have their interests at heart (former Labour strongholds that voted Tory in the 2019 election and for Brexit). There have been decades of newspapers telling that cohort that immigration is what is causing their misery.
To cut a long story short do not assume that Reform votes will bolster Labour's chances. If those traditional Labour strongholds don't come back into the fold, we may well see seats held by Tory's or worse taken by Reform.