Ok people, I've found a new intermittent leak from behind the dash in the 110 that I'm reasonably sure is responsible for the rotten floor on the passengers side. It's not coming from the screen hinge bolts but working it's way in from behind the dash somewhere - I'm guessing it's screen / bulkhead join but wondered if anybody had any suggestions? I've tried the water ingress manual (where exactly do you get Dum Dum?! Or Putty?) but I can't place this one.

Any suggestions as to source or solution? Is it worth running a bead of something along the bulkhead / screen join? I've tried to attach a picture but it had stopped pouring in at that point - it is definitely coming from behind the dash somewhere though, not the door seal or screen hinges.