Most first aid kits are put together once and never looked at again. The tin of plasters under the bathroom sink, the sealed kit in the car boot, the one that came with the house. They tend to sit untouched… 

Most households have some version of a first aid kit: a tin of plasters in a bathroom cupboard, a small pouch in the glove compartment. Very few have a kit that is actually stocked for a real emergency. The gap…