Andy mine only occurs when I am driving in heavy rain. I found some water running down the bulkhead in the footwell but my concern is it is getting in from floor level although I can see no damage and everywhere is solid, no rust showing. I only bought the car a couple of weeks ago and I know it has been garaged from new and although 10 years old only has 28k on the clock. So I am wondering If some of the seals have dried out but which . Clutching at straws really.