Having seen some first aiders in action, I'm not so sure that the standard qualifications available out there are necessarily up to much: so no, I don't think qualifications as such are really needed for a teacher more than for any other career: however, on a purely social basis, I think there very much is a case for all of us to learn how to do the basics - calling 999 in a rural area will get help, sure, but only twenty or more minutes down the line, by which time it'd be too late for the unfortunate victim of a cardiac arrest. I didn't realise until I was having to attend CPD sessions at work how well I'd been taught as a child - basic resuscitation training was a key part of learning to swim in my school. In retrospect I'd like to have seen that be extended to management of diabetics in hypoglycæmia, and of epileptic fits and minor injuries too - and I really do think that this could usefully be taught to everyone, and wouldn't take a hugely long time to learn. One of the worst things which happens when medical emergencies happen is that people panic and flap, and then do things which at best are not helpful and at worst downright dangerous.
How often would any of us expect to come across such situations? I'm no ambulance-chaser, but in the last ten years I've stopped to help two cyclists who've been knocked off their bikes, have directed traffic around and quickly assessed two pedestrian accidents (in one case, the other person who stopped to help asked me was I a physician, and when I admitted I was, and asked him if he was too, it turned out that a GP and a professor of tropical medicine had stopped for what was patently a broken leg

), and assessed and given advice to someone overwhelmed by the heat this summer......as well as having to deal with the usual knocks and tumbles one can expect of one's sprogs

. None of these situations arose near me just because I'm a doc, I was just there at the time, which is why I think it'd be best for all of us to know what to do.