V8 Vantage: Dampness on the drivers door and leather

[BlueStreaky]

HI, I'm new to this forum. I bought my 2009 V8 Vantage six months ago and I've found that overnight there is moisture building up almost at the hinge of the drivers door and soaking the door itself at that point and the leather facing it. I've replaced the rubber seals for the door itself and for the wing mirror - which seem the two most obvious. There is no sign of water ingress anywhere else that I can see.

I wondered if anybody had any ideas about where the water could be coming from or how to stop it?

Many thanks in advance.