New one on me-I don't think many people have had this problem at all. Could it be coming up rather than down (boot floor?).
Otherwise, try putting some talc on the rubber boot seal then turning the hose on it to see if you can see where water is trickling in.
You could climb in, but it's dark when you shut the hatch......
Steve - 2002 1.4SE petrol, Silver, black/black interior, Then an identical replacement 2003 A2. Now a Toyota Corolla 1.6 T-Spirit
