'Sometimes it is a bit sad that concertina playing has not been subject to "academic tuition" in similar way as accordion playing ( to some degree...) has at some musical university institutions. I am not so keen on theorizing practical matters myself but sometimes it may help no doubt"
Concertina playing has been the subject of many tutors, I have two at my website, www.dickmiles.com
there are also many workshops at festivals and also organised by concertina groups which do help with tuition.
Piano accordion players[ partly because of the weight of the instrument] are often in my experience, guilty of not thinking about bellows use, so much for piano accordion academic tuition., it seems to have had very little effect in the folk world.