The thing is, that in health matters I just follow the advice. So if I’m told it’s Ok to wait 12 weeks then that will do for me. It now appears that everyone seems to accept that the AZ vaccine can be treated this way and that your concern is just about the Pfizer. Now as you have stated, it was the first one we used, and sure enough second doses were apparently given within 21-28 days following manufacturers guidance. Now considering that the vaccine that will mostly be used in the U.K. is the AZ one, then I assume you can accept that at least that part of the strategy is OK. In respect of the Pfizer, had I been offered it, I would be more concerned over its future availability (EU export ban) than the NHS etc etc telling me that a 6-12 week delay between doses is OK.....