I've got a 95 A4, and at speeds of over 40mph I can hear the outside world whistling by as if the door is partially open. The door closes flush, and the seal is completely intact.

If, while driving, I grab hold of the door frame at the top of the window, near the alarm sensor and and "nip it" to the bodywork the noise stops, leading me to believe the door is possibly a tiny bit out of alignment and should be closing perhaps a couple of millimetres further.

Can anyone help me with this:
a) am I barking up the right tree? and
b) how do I adjust the door itself to try and fix the problem

Cheers!