Stuart,
I can see what you're getting at, but I would suggest that river crossing or mountaineering are somewhat specialised activities which would not need the aforementioned list of kit to be carried. Items such as camera, binoculars, even watersteralising tabs suggest that there is time available to use them, and hence the need to "dump your kit in a hurry" is questionable.
Crossing rivers and mountaineering are activities which I would have serious reservations about undertaking alone unless safety arrangement had been made as to route and timing - so any rescue could be initiated. Even the situation you mentioned about loosing a bag, the owner was able to retrieve it and was in a group, so the "lone survival" aspect becomes less serious than is portrayed.
I don't want to scare Malcolm off as he's only recently joined the forum and has asked his first question, but some things make me wonder;
Compass but no map??
A mobile phone could be of use in an emergency but coverage is questionable - my house has no coverage! Why not carry a whistle?
Two water bottles and steritabs, why not one water bottle on your belt and one in the pack.
Knife - I don't see too many hikers wearing a knife on their belt but to cut straps in an emergency could be reason enough.
Optical equipment, as I've said, suggest leisure activity rather than E&E.
Torch would suggest to me that there is an intention to be out overnight - when thoughts of a basecamp are in order so there is reduces need to have it on your person 24/7.
Survival tins & FAK make sense when alone.
I'm thinking that a bit more thought and a more relaxed attitude might lead to a more enjoyable experience.
Ogri the trog