I recently purchased a late 2009 Auto Diesel and love it.
I too have the same sound when going over bumps and it has been diagnosed as ARB bushes and is booked in for replacements.
Also the previous two MOT's have flagged up corrosion on the rear coils and wear on the dampers (misting of oil).
As I believe this car is a "keeeper", I am having these changed at the same time