Pre-soaking the oats can make a HUGE difference for myself and many who I have helped. Just cover in water in the fridge the night before or even a couple hours before consuming can make a world of difference.
At least here in the states you can get this stuff and save the trouble of grinding:
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$0.17 an once when buying the small bags so not outrageous. Largest oat carb powder from a supplement company(muscle feast) is $0.27 an ounce so huge difference.