Originally Posted by macrs

As mentioned above, it's probably the rear subframe bushes..
I had exaxtly the same thing on mine! Replaced the drop links first, made no difference..
Then I did the subframe bushes, problem gone.

The ones shown are the powerflex poly-bushes, I used those but they're not cheap!
Hopefully though your warranty will cover you!
Mentioned above are the common bits to go, but get all of the rear bushes checked.
I also had a broken rear spring prior to the subframe bushes going...

I didn't use a realignment tool, just fashioned my own alignment 'pins' for the locations on the subframe.. Seemed to work for me, as 10k miles later on tyre wear is all fine....
Hope this helps mate...
There's some great people on this site that pointed the way for me!!!