I've put this (very crude) diagram together (attached) to show where I've tested with tape (green
) and where I haven't yet tested (red
I do stress though, it definitely seems to come from the roof but who knows....
Next steps after all that, I'll be looking for small holes, for example, there is a small hole in the rear door, which can only be seen when the door's open. It is behind the bottom window sill / seal and will lead right down into the door card. (I've marked the location of this on the diagram in yellow
Could air be twirling round the trailing edge of the door and going into the hole? Creating the noise? Hmm...
One last thing, I looked at this American site:
I would be willing to use them if UK based, do you think there's somewhere similar where I could get it tested in a wind tunnel or similar? Some sort of car leak specialist?
It states on their website (in Services > Wind Noise Repair) that:
"Almost all wind noise complaints involving automobiles are caused by air escaping from, not entering, the vehicle."
That just confuses me further... lol