330Ci Rear Rattling noise???? HELP!

[sprite330ci]

Hi

I've got a 2001 330Ci Sport. I've recently had the discs and pads changed all round, along with Goodridge braided hoses all round.

Also hae 4 new tyres fitted and the alignment done.

All the work could be coincidental, but there are loud rattles coming from the rear of the car, on both sides. Only when going over bumps, especially on country lanes where there are lots of small bumps. Sounds like a tinny rattle, like somethings loose, but I've both wheels off and cant find anything.

Any ideas what this could be? Is there a common thing with the E46 that anyone can advise me of?

Thanks in advance.

Jason