Disco 2 Going nuts! High pitched wind noise when going over 100km/h

Hi guys,

some time ago my disco developed some high pitch whistling noise when going over 100km/h

It only happens when one (or more) window is open, and seems to be coming from the passenger (LHD) side, but I'm not so sure. Can't feel wind passing anywhere though

Recorded a video, hope you guys can hear it with headphones:



Thanks