For further info i took the door panel off today and found the plastic membrane which directs water to the door drain holes and prevents it entering the car had come unglued all the way around the bottom and it was clear from the mildew and slime that this had been the entry point for water. I stuck it back into position with "i can't belive it's not nails". havn't tested it with a watering can yet but i'm 99% sure it should be okay now
peter benn, December 2007