As has been already suggested, The Fiskars sewing scissors, are just the right size, and are available for less than £10.
Bought my mother a pair for Christmas, to replace some very blunt and well used Fiskars, purchased over twenty years ago.
Very high quality, and about the right size for a first aid kit.
They may be designed for sewers, but they make a great all round scissors for trimming plasters or bandages.
They are very high quality, and represent good value, and should last many years of good use.