In reply (general) :
I’m a member of a Mountain rescue team. On a rescue we obviously carry quite a bit of cas care/ resus kit. However there is also a recommended small kit for personal use when out and about in the hills.
I carry hypostop, aspirin 300mg chewable for MI, (but check for history of severe allergic reaction), paracetamol for low grade pain, (diclofenac - this is not available over the counter without prescription so not generally available - for moderate pain)
blister plasters, (also cling film is useful)
I do carry a wound dressing, but am trained that for serious bleeding they only really soak up the blood, not stop it and that direct pressure is required in this situation.
Tough cut scissors
If you suffer from asthma then not forgetting your inhaler is obviously important, likewise if you need to carry an adrenaline autoinjector for known allergic reactions.
In my experience the most striking feature of illness or injury in the hills is how quickly and incredibly cold a casualty becomes once immobile, even in apparently ok weather - add rain and wind and the situation quickly becomes very serious. So I agree with the above comments about protection from the environment being important - a bothy tent and some means of insulation from the ground being potential life savers.
Obviously whilst coverage is variable in many hill areas, it’s sensible to carry a mobile phone even though in SOTA activities we also have a transceiver. The coverage is far from non-existent, even if patchy, in many SOTA areas in England and Wales. If you can raise the alarm half an hour earlier than otherwise you may be improving your chances. If you have coverage, the MR search manager will be keen to talk to you directly if possible before the first rescue party gets to you.
Finally, knowledge is of more use than kit - I think that when not on a rescue our very experienced team doctor carries the smallest first aid kit in the team.
All the above is offered in good faith but with some anxiety as last time I offered standard MR advice on lightning I rather felt as if I was flamed for it!
73s Neil (MW0ECX)