Thanks for that Katy. What I like about the bought pack is it has a range of cereal: oats, wheat, rice, millet, barley, maize and rye. It makes me feel like he is getting a good range of grains. He won't eat rice or rice cakes, he does eat oaty chews (kind of flapjack type thing, home made) but other than that he only gets wheat, wheat, wheat (bread type things and pasta)
Just not sure if I would need to DO something to the grains before whizzing them up.