Have you had the windshield replaced? It's pretty common for cars to leak water down the firewall from the fastener holes on the cowling at the base of the windshield. Usually this starts when the fasteners are removed during windshield replacement. They don't seal the same the second time and might need some sealant applied to them. This is only a problem on cars with fasteners that go through the firewall obviously. I've heard of this problem a lot with EF and EG hatches, so I'm assuming your car is probably subject to it also.