Hi,
I have one of these beautiful alumininium beasts. Underneath, roughly in line with the windsheild, there are acouple of holes in the floor pan, about 2cm diameter, with plastic bags of water above them. Yes, bags of water in resting on the top of the floorpan.
What are they for?

 

I would really really like to be of help.
If only I knew what you were talking about. What aluminium beast?

You do realize this is a Jaguar X type forum!

 

From the looks of the photo in your profile you have an X350 and should ask in that forum.