They can't take power until 2029, but Reform lead the polls at the moment, and it needs a sizeable swing to stop either a Reform majority in the Commons in 2029, or a Reform-Conservative coalition.

Roughly, £41,700 a year puts you in the top third of earners; £60k in the top fifth. Farage's use of the "save £234 billion" statistic has already been pointed out as wrong by the thinktank that originally produced it, saying it's inaccurate and they will recalculate it. Farage is also leaning heavily on a claim that over half the people allowed in using the visas, either the people themselves or dependents, "will never work" in the UK, so he calls them out as a burden to be removed. Where this claim came from, I can't tell. It sounds dubious to me; once they're allowed to work, most people do.

The retrospective nature of Reform's ideas has many already questioning if it would be legal; Reform replied "parliament is sovereign, so whatever it decides is legal". So they could make it legal, but it would still be morally awful to start deporting people who have done everything legally and been given indefinite leave to reamin.