It hasn't worked in changing policy, or meaningfully changing who's in charge. Currently the government is getting its way with this sufficient level of brutality.

I think it's likely they will get still more scared that they won't, and ramp up the brutality accordingly.

The path forward is clear: Reform gets into power, builds their own paramilitary "immigration enforcement" groups a la ICE, and you get the occasional summary execution in the streets, along with arrests based on UKs unmatched surveillance system.