The small boats crossing are a small fraction of immigration. Some Google number claims 37k people got in this way in 2024. With net migration hovering around 0.8-1m people per year, arrivals must be well above this number (surely some people are leaving, making the net number smaller). But even then, this is less than 5% of the legal immigration, and probably a lot less than that.

I'm not saying it doesn't need addressing or isn't serious, but I think it's a convenient topic for politicians. It's a lot more media-friendly than the arrivals queue at Luton Airport. And the illegal immigrants aren't the ones putting pressure on NHS, housing market or train driver unions.