You need more like 70% vaccinated to create the kind of "herd immunity" ....

I agree, Silly, and it may be more of a problem in the US than the UK (but it could be bad enough here): What do you do if you can get to 50-60% vaccination and then cannot really increase the level further because of anti-vaxxers and the like? Also, it is important to remember that there is probably 5-10% who can't take the vaccine even if they want to, like those with immune system problems.

I would certainly prefer us to get to maybe 70% before relaxing at all, but if the resistance to people taking the vaccine is high enough, I might have to relax before that.