I know a lot of people who have voted Reform and they're not Nazi's or far-right. They're just normal people who usually vote Tory. The party itself has its odd share of nutters of course but that isn't because the party has far-right policies.
They want to nationalise utilities, cut taxes, sort out the cost of living.. These are not far-right policies. The only policies that sit remotely close to the far-right are those on immigration but they're advocating to slow/stop immigration and not to start shooting immigrants. Slowing immigration is a very popular policy.
I don't agree with Reform btw, but I think we need to understand people and not just cast them aside or don't be surprised when they turn to the extremes. It's highly likely that Reform will be the 3rd/4th biggest party by the popular vote, I highly doubt that 5-6m people have turned into Nazi skinheads.