Last week I started to notice a damp smell in the car, and some investigation revealed that there was a wet patch on the floor in the passengers footwell. Now we had a lot of rain last week, and I thought it might just have been tramped in by someone I'd given a lift to. The weather dried up through the week and the patch on the floor dried out. Then we had more heavy rain on Friday night, and on Saturday the wet patch had returned. There were no passengers in the car, so I know it wasn't brought in that way. I checked around the door seals and there's no sign of any leak there. I also checked the pollen filter to see if it was wet, incase the water was coming in from the ventilation system somehow, but it was dry too. Has anyone else ever had this problem? I'll want to investigate further, is it easy to lift the carpeting from the footwell to see what might be causing the leak? Any suggestions greatly appreciated.