O2 and AED should be standard stowage, along with a trauma kit as Burnside has. Its not rocket science to use either of them, and you can't really screw it up.
you're right - first aid is just commonsense - I'm still baffled why people get excited telling me that they've done a first aid course when I get to jobs..
...at the end of the day - first aid is pretty much along the lines of
-if it's bleeding -stop it.
-it's it's broken - stop if moving.
-if it's not breathing -breathe into it.
-if it's not breathing coz it's blocked - unblock it
-if it's not pumping - pump it.
-if it's hot - cool it down and Vice Versa
6 simple little rules and I can do most things related to both trauma and resp/cardiac arrest without thinking too much about it. Anything beyond the above isn't first aid anymore - and you need lots of tools to do anything about it.
as for AED's and oxygen.....you aren't gonna do any harm with it unless the machine is faulty (so you can refer any complaints back to the manufacturer) and you're all smart enough to know what oxygen does to fire.....so I don't even need to go that far!!
I know we're not the states...and 1st responding to medical calls isn't your bag - but it wouldn't be bad seeing the aforementioned items on all appliances just so you can help yourselves if nothing else!!