The cause of the noise has been found on my stilo, it is coming from around the mirror. If you take a look at the side which is not giving you any problems you will see that the mirror presses into a seal, which almost appears to rest on the seal around the window. Well it is here at this point there is a problem the bottom part of the mirror appeared to be pressing onto a seal running behind not pressing onto the seal which should be proud, it looks like a tiny small,intentional crack which is at the bottom of the mirror housing.
We covered this part up with masking tape and followed the line as it should to the front seal, then took it out for a test drive. SILENCE up to 85mph (on a private test ground, OF COURSE)then the tape itself starts to oscillate but the noise it makes after this threshold is tiny in comparison to the noise it used to make at 40mph.
The seals have been ordered by fiat and will be replaced shortly, i hope this helps you all.!
!!!!!!!!!GO IN PEACE MY FIAT WARRIORS WE WILL DRIVE IN SILENCE!!!!!!!!