Under the rear mats my carpets are slightly damp and I get a bit of condensation in the mornings.
I just took these after a torrential downpour. Should I be worrying about door seals?
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Yep. You sould be worrying, because normally the water shouldn't be there on the door rubber. That means it comes from the door card. If you say that the carpet is wet, I'm pretty sure the soft soundproofing under your carpet absorbed much water. Try to press on the carpet and feel if it's soaking... You also can remove the trim and check if it's ok under the carpet. To check the door just remove the doorcard and see if there are traces of water in the bottom of the auxiliaries panel.