It's worth bearing in mind that there is a new variant around which is partly responsible for fuelling this new talk of plan B etc. Govt doesn't know yet how effective the current vaccines are against this new variant, indeed any other variant that comes along. Also bear in mind that the efficiency of vaccines will decline over time, hence boosters, so people are always vulnerable to some extent or other. It's an evolving situation and will remain so for years. Anything that can be done to reduce transmission rates will help. Being double vacc'd isn't the gold standard, there will likely never be one.
keep living in fear with your lucky underpants on…..are you this worried over all diseases or just this one?