When I hit 65-70 Mph a strange rattling noise occurs. To me it sounds if something is rattling against the windscreen. The noise keeps until I go above 85 Mph when it disappears. It was suggested that maybe the wheels needed to be balanced. I took the wheels to be balanced but sadly this didn’t make any difference.

I hope somebody can help or suggest what the problem could be.

https://youtu.be/vj9VS2yZiSE