Still potching with trying to get a decent recording I resorted to the little ‘map’ of where everything is and discovered the mic pickup is beside the lens for the front facing camera – i.e Flat on the desk when using the rear camera!
Another experiment with it carefully uncovered gave somewhat better results. And using the front facing camera works fairly well.
Rear facing camera with mic unobstructed!
And using the front facing camera as we might in an observation.