SundanceUK

First see if the water has antifreeze mixed in with it, it should turn a bit of paper pink if its dipped into it.
If this is the case then the water is possibly coming from the heater matrix which sits above and behind the centre console, also there are water pipes that feed through the console going up to the matrix.
If it looks like rain water then maybe its coming from the snorkel, the seal has a habit of perishing and allowing rain to get in through the front bulkhead and down into the area behind the console and into the passenger footwell.
May be a good idea to pull the carpet back and see whats in the footwells too....the carpet has a plastic membrane and can be perfectly dry on top, but sitting on a puddle of water that has collected in the footwell.

Sundance