Re the water in the spare-wheel-well...
My 2008 model always seemed to have a little water in the bottom, and I put it down to a minor leak somewhere.
I got a new M6 a few weeks ago, and moved all my cr*p from the old car to the new one, including my spare wheel - a full-size alloy. In the morning, I put some more stuff in the boot and discovered the metal part of the wheel was covered with condensation - presumably the cause of he water in the old car's wheel well.
Now I know why they call it a well!