A problem I am well aware of both as a teacher and parent (though luckily FC hasn't had them for some time!) Did you know what in England the school nurses can no longer check for the little blighters as technically it is classed as assault!!!!

As an aromatherapist I mix teatree, geranium and lavender into (preferably leave-in) conditioner and apply it to the hair. The secret is to wet comb the hair with a fine tooth comb VERY thoroughly and repeat the excercise every couple of days until you get on top of it. A set of earplugs so you don't hear the complaints are also useful.

The same mix also acts as a preventative if used fairly frequently. Since the little dears at school had passed them on more than once previously the problem no longer occurs whilst I've used this method.