Thanks Rob, I definitely need a tube of this.
Some more developments
I pulled the carpet back a couple of days ago to see if I could track it and it has of course rained so I have had chance to figure it out (some what) where the leak is coming from.
It appears it isn't the screen at all, it's coming in from the door somewhere, possibly under the door seal.
The water starts from the top of the arch where the seatbelt bolts down.
I have had the door card off, it appears to be damp but not soaking to the level you would expect to get a big puddle like I had this morning. There is no plastic backing so it could be condensation.
The mind boggles, I need to track it down. Any suggestions appreciated