Sportka leak into boot

[Prince Rupert]

My Sportka has a strange leak and I was hoping somebody might be able to help me diagnose the source.

Water is leaking in making a damp patch where the boot floor carpet meets the boot side carpet (the carpet which hides the suspension turret and rear light cluster) on the passenger side. Strangely it is only wet where the two pieces of carpet meet at the boot floor suggesting water is somehow accumulating there. Removing the carpets shows some dried water marks running down the suspension turret and the metal area behind the turret. The side of the folding rear seat where it meets the rear wheel arch is also damp. Where the water coming through a leaky seal from one of the doors or windows it would have to run down further to get to this point soaking other parts of the car and leaving marks. As such I was wondering if it could be coming up through the rear wheelarch somewhere? Anybody know if the Sportka has a vent in the rear passenger side wheel arch? Or any other suggestions as to where it could be coming from?

Any help would be much appreciated.

Thanks