In reply to hindu:
> My recent and in-date training is generally around "something's gone bang and he's got a hole in him or he's missing limbs".
This is exactly what stuff like Celox is designed for but, as I am sure you will appreciate, very different to the combination of head injury, visceral injury and multiple fractures you will get from falling off something
> Would you agree that the best that most of us can do on the hill is put a plaster on it and get on with our day for the minor stuff, or if serious, not screw the casualty up too much while the professionals get there?
The first aid you will use most often is for treating trivial injuries/illness so that you can continue your day. Hence things like plasters, tape, analgesia, antihistamines will be most useful.
The problem I have with first aid courses for remote activities is that a lot of time is spent teaching basic life support. This will be no use if someone has a traumatic cardiac arrest and equally useless for a medical cardiac arrest unless you are next to a road and an ambulance can arrive quickly.
There is scope to teach some simple stuff that would be much more useful e.g. reduction of a fracture dislocation of an ankle. Doing so is simple (usually) and involves little more than brute force to make the ankle look ankle shaped again. Doing so will not only massively improve the patients pain but will have a huge benefit in terms of their subsequent surgical treatment as the skin will suffer much less damage if the ankle is promptly reduced. The only two things needed to reduce a dislocated ankle are a little bit of training and the balls to have a go.