But all the seals seem fine! Any suggestions, or has anyone else had this problem? It is only when it rains so must be coming in from above...
Try parking the other way around as it may help to show up the leak better. A lot of us found that water ingress into the boot didn’t happen if you reverse parked on a slope.
The car's always been parked on the flat though. And there is no water or damp anywhere else in the car...
I have never heard of this, what I would do is take out the carpet (not that hard) and see where the water is coming from