the seals on most mk2 have been on the car for about 15yrs so have deterioated. the problem seal is the one that runs up the A-pillar and along the roof edge
fix on the cheap.....
re-align the door first off and see how that is
only other thing you can do is try and get the door to be a tighter fit. just loosen of the door strike pin and tap it inwards a bit. this will squeeze the door into the seals more.
this can ruin the lines of the car a bit as the door sits slightly more in compared to the rear qtr panel. but its all trial n error
alternativly, not so cheap......
replace the main door seal, and re-align the door!