YuK!

[HPsauce]

That's them. Have a container ready to catch the water when you disconnect them, the condensate tray can hold quite a lot (couple of litres maybe)!

But if it was filling up you'd almost certainly be getting the water sloshing and wet feet symptoms as well.
You can also end up with water in the pipes that lead to the rear seat ventilation, that's fun! Try all combinations of air outlet (all closed with just one open at a time) on max fan and see if you get any spray.

My own experience is that blocked scuttle drains are the ones that result in lots of windscreen condensation, even before they overflow to the interior.

[Goran]

Thanks, I'll have a look at them. First though is to poke them from under the car without disconnecting internally, if that releases any blockage & water I can avoid removing the carpets.
No sloshing sounds so far.

[HPsauce]

I didn't think you could get at them from below, and anyway they tend to need removing and washing out properly..
Passenger side is much easier to get at so do that first.

[moltuae]

Originally Posted by HPsauce

My own experience is that blocked scuttle drains are the ones that result in lots of windscreen condensation, even before they overflow to the interior.

Actually, thinking back, I think I've noticed that too, or at least when there's some water beginning to gather in the central area, just below the HVAC intake. Certainly that would be the easiest place to check first since you can usually see any build-up of water there without dismantling anything.