Thanks for the comments.
I should have mentioned that I have a 2012 model. What I referred to as an adjustable air foil seems to be described by the term vario elsewhere. It's like the after market, stick on "laminar lip" but moveable.
In any event, when I moved this lippy, foilish device downwards so that it no longer protrudes over the top of the windscreen, the odd noise concentration seemed to abate. Don't understand it in terms of physics. Maybe it's a placebo effect.
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