Interesting attitude to vaccination/covid protection (in mid-70's so presumably still classed as 'vulnerable').  Leaving on a ~3 week round world+ business trip mid-Jan.  Five countries (+ two in transit), dozens of in-person meetings, five nights sleeping in the air, ... so exposure risk presumably fairly high.  Six months since my last vaccination comes up 8 days after I leave. 

Enquired with my medical centre about getting another booster before I leave but they are adamant I cannot get one until the full 6 months is up!  Like a matter of 8 - 9 days short ...  rules must be followed.