Following a vigorous jet wash session on my little used Jaguar S type (2000) I found a major lake of water in the near side carpet

Going into panic mode I attempted to drain the "lake" using a Vax.
Next job was to find out how the water had got into the interior. Examining the various door seals they all looked in good condition and the sunroof drain tubes were clear.
The soundproofing on the near side front firewall was also soaking wet which suggested that the water was coming via the engine bay.
After stripping out the front screen lower plastic cover I found the remnants of a mouse/squirrel nest and the drain hole on the near side was stuffed with have eaten walnut shells.
Looks like the water had backed up and flooded through the heater fan intake and into the car.
This car had hardly been used since Covid. It just goes to show that living in the countryside has it's downside.