At last, I've finally found someone who carries more stuff than me! If I ever have an accident I hope the next passer by is you.

Seriously. But you were looking for advice so...

There are lots of things that could be excess weight and that could be cut back on but .... and its a big but. I carry my FAK as EDC in my daypack with a smaller kit in my jacket pocket - I do not drive (but have a motorbike) that means I have to watch for bulk and weight. Since your kit is in the car then obviously that isnt an issue so by all means take the lot.

Ibuprofen - you carry a lot of doses but I would suggest 400 mg tablets not 200 mg but thats just my preference there are arguements both ways.

Consider an epipen for anaphalactic shock - but only if you know how to use it or are carrying it for someone else who can but has left theirs at home - I see that some of the stuff you carry is in this category anyway such as sutures (note that I have chosen not to carry this as I am not confident enough in its use although one of my friends has severe nut alergy and always carries one - I made the conscious choice only to carry what I can use myself)

Consider transfering some meds to your always carried travelling kit, specifically analgesics, anti-inflamitories and antihistamine. I dose of each (or 2 ) is very useful.

Consider stronger analgesics for personal use in your travelling kit I would recomend 30/500 cocodamol or 50 mg tramadol (both prescription only), the cocodamol is probably more useful and generic. and has the advantage that it wont clash with an anti-inflamitory (tramadol is a NSAID)

Again personal preference but my FAK also gets used on my dogs. Dont know whether you have considered use on animals, the last road accident victim I helped as a passer-by was a dog. Irrigation of a wound in the field is very difficult through fur so I carry a spray can of povidone/iodine dry powder spray. That way I can cover a wound with antiseptic and deal with it better at home (or at the vets).

Also think about removing the tweezers and scissors from your small personal kit that way you can have it on your person while flying and not have to put it in checked in luggage