On the NHS, I tried for years to push for improvements to switch to digital cancer screening invitations after they missed my mother (offering to build the software for free), which is now happening, but suggesting the NHS isn't perfect is against the religion here. My sister who works in NHS DEI hasn't spoken to me since publishing a book on it.
Every time someone with the finances, vision and ability leaves I think the situation gets a little bit worse, it increases the proportion of people remaining willing to put up with all of it. Anecdotally, many of my friends have already left, some of the older generation want to leave but feel tied in. My flight out is in 6 weeks. Good riddance, no doubt.
Skilled immigration or the Channel crossing?
Unfortunately due to the Boris Wave, we got mass, unskilled legal migration.
The channel crossings are a rounding error compared to that (but should be stopped as well).
20 years ago it was mostly Poles whose only quality was that they were willing to work for less than native UK citizens in jobs that said UK citizens supposedly did not want to do (which is doublespeak for businesses not wanting to pay a decent wage). This kind of immigration was one of the reasons Brexit happened.
It was more the later additions to the EU a few years later that were actually problematic and got people's backs up.
It didn't help that we were allowed to restrict immigration from those countries but didn't as the government needed mass immigration to disguise the fact there was no growth.