I understand the logic, but there is one out side our local Co-op unless somebody has a HA inside the shop & somebody knows the combination to the keypad & then knows how to use one, they just come across as an ornament.
I understand the organisers of a fun run are required to have one/several onsite/available but they normally get the St Johns in to do it, who will have the equipment & know how to use it. I know when I just to run Horse shows it was in our insurance policy we had to have medical on-site.
I'm not objecting to them & if they save lives then good, but it seems to me that somebody who has an interest in them convinced somebody it was a good idea to have them put everywhere, seems like a jobs for the boys type of affair, one of Boris's pals maybe.