I'm not sure of the difference in a classroom/ teaching assistant but at the school I work at if you cover PPA time you are paid for just those hours at a higher rate. In terms of your extra training (congrats on completing it by the way) unless the school asked you to do it for your job role I doubt they are obligated to pay you at a higher rate. We have a TA who has a foundation degree but is still paid on the same band as the others because it was her personal choice to do it.
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