Do you have wind noise in your car? Not that sort of wind!

I get wind noise from the top of the drivers door. The other door is silent. The rest of the car is silent. Its a quiet car.
I pick up a friend from the airport. They said 'have you got your window open' when I was going about 70ish mph. I then spent the rest of the journey trying to find where it was coming from. I'm still not sure as it seems to come from somewhere and everywhere around the top of the window/door.
The dealer checked the door, drove me around the block said it looks OK. They fiddled with the door and tightend it a bit but it is still there. If it was an older car you expect this sort of thing. Its a silly niggle but a frustrating one on a new car.....
Any advice?