Forgot to update, turns out they are Qld fruit flies. As yet they havent done any harm to the plants but are bloody annoying so i have a few traps set. So far they are working well.
We have had a tonne of rain of late (not normal) and I read that these flies like moisture, Hoping it will dry out a bit soon.
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The plant which had the leaf damage (initial photo) was a poor quality sick looking plant to begin with - it never improved so it got disposed of to save the good plants.