I think you are worrying too much and a lot of this is media hype. Their main focus is small boats and people entering the country illegally. If they do restrict them more you are almost certainly better off getting your partner a visa before (but I think you would need to marry to get a spouse visa though).

> Reform would get in and throw out all the "undesirables" (basically anyone without a British Passport at first, sure they won't stop there)

I think that is an exaggerated view from a distance. I see no evidence they can do that, or want to. At the time of the Brexit campaign Farage said he wanted skilled immigrants (he gave the example of Indian doctors immigrating in the 1970s as the wort of thing he wanted). Nor can the country afford to lose skilled people. Its worth remembering that Reform would not agree to what Elon Musk wanted in return for funding so I think its safe to assume Reform would not be as extreme as the current US government.

I am of foreign birth, as is my younger daughter (she was born abroad) and I am not particularly worried. I would worry if Rupert Lowe's Restore party started making gains, or Ben Habib's Advance party.

> I'm really not sure how likely them attaining power

They are doing well in the polls now but my feeling is they are peaking. Letting on too many Conservative defectors makes them look at lot less of an anti-establishment party (a huge part of their appeal) and they are becoming too extreme (I think in reaction to the splash, mostly on social media) made by Advance and Restore (one of those is what Elon Musk endorses, so that gives you an idea where they are).