It's in their pledge book online so feel free to look it up (i make a point of reading all party manifestos before voting and I suggest others do too).
The point isn't really what they would (or wouldn't) do, the point is that people are fed up of feeling like they work hard or broken services and any extra people (migration, refugee, those on benefits) are being lumped into the same group because it doesn't feel like their is enough to go around. Even the most hard line people can accept a Brit on benefits (even if they think they are "scroungers") but where migration is concerned, its physically more mouths to feed.
Add to that that migrants get things that Brits who pay into the purse don't get e.g. migrants get a free dental checkup and treatment within a month. When was the last time you, or your kids, had a free check up? Dentistry is practically privatised in Britain (unless you're a migrant).
The point isn't what Reform are going to do. The point is that unlike the Greens or Libs, they are the only party saying they'd take a hard line and haven't had a go yet.
The more people are told to basically shut up because they're racist and there is no problem, the angrier people get and feel like lashing out by voting for a party that says what they want to hear.
It's like the NHS bus. People think the NHS is fucked and when they contribute to the tax pot and can't get an appointment they think "why are we sending money to EU when I can't get a local health appointment?" so they vote for a slogan saying "let's fund our NHS instead".
It's not even really about migration , it's about:
- Not feeling like hard work pays off
- Feeling like someone else is getting something you aren't even though you're contributing and they aren't.
Plus, as you've seen, some people feel unsafe in areas where many migrants have arrived en masse (which again strains services)