Hi fellow mini fans
I had this problem on both current mini and previous mini(both R53's 52 and 06 model). I found a fix by having the windscreen resealed.
If you have the same trouble as I did, the noise is at motorway speed. Try check this by getting a passenger to slightly press against the inside of the windscreen when the awful screaming starts. The noise will stop if you have the same problem as I did.
If this is the case the deal should reseal the screen under warranty.
hope this helps
