Water Ingress - Driver's Door

Took the driver's door panel off to replace the speaker, to find that the speaker cone had rusted and that there was water getting into the inside of the door cavity. Not huge amounts, but a regular drip. Any thoughts on most common places where seals may have gone? Is it likely just to be degradation on the window seal or something? Any thoughts appreciated, and happy Christmas to everyone!
 
First check that the drain holes at the bottom of the door are clear. Water will get inside the door in small amounts via condensation, but it should come out the bottom of the door, so also check that the vapor barrier (plastic sheet kind of thing) is intact.
 
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