Hi scrandman

Took that right off, in fact, took the wheel off and arch liner off to have a look in voids etc but couldn't find any water. It's still there though, still swishing around. Sounds like a good litre or two of water.

 

Update.

The water sounds like it's behind the glovebox. Does anyone know of any components or areas near there that could contain water? Also, if I open the bonnet and stand near there and rock the car, I can't hear the water as much at all. It 100% is loudest in the passenger area, and especially near glovebox....

 

Exact same issue as me. In fact got the car cheap because of the wet passenger floor board.

It was the nuts holding the sunroof rack. Untill I pulled the headliner down to reach in there you could not see any issue.

Tightened them and all good for 50K miles