Thanks 
Herd immunity can be achieved by a certain percentage of the population being immune - whether through vaccination or recovery from natural infection. People who decide not to have the vaccine are prepared to take the risk with the virus and gain immunity that way. They will still be contributing to herd immunity which will protect the vulnerable who can’t be vaccinated. I have no issue with that at all.
Arguments that people choosing not to have the vaccine are going to cause mutations do not make sense because there are millions of children who can’t be vaccinated and mutations can occur in them too. We are not going to eliminate the risk of mutation by vaccinating adults when there are millions of unvaccinated children in the U.K. and millions of unvaccinated people around the world. The virus is going to continue to mutate. And that bit is where we diverge a bit. That was what part of my list was for.
Currently kids are not being vaccinated because of what has gine before, standard practice etc. But further studies are being done, on kids under 16, so all of that might change. Just as understanding of just how much kids are a vector for transmission is changing!
Currently we are doing what is possible, fingers crossed for what isn't. Which is an aver changing picture. Who knows how diferent our undertsanding and approach will be in a year or three?
As for those around the world. Some countries be affceted far less, geography, climate, population density etc.
Covax is there to get vaccine where it is needed but cannot be afforded (plus Canada because they signed up for it!).
Mutations tend to be weaker than the parent virus. But some of this is new ground for allscientists involved. So we don't know yet. Can only do what we think is best, based on the best oinfrmation available.
So, in short, I don't think the numbers of unvaccinated peple will change policy. But changing policy will reduce the numbers of those that remain unvaccinated.
Eventually we will know whether or not an annual booster is needed for some/many!