When you say "rattle", do you mean more of a "knock"? Because it sounds like maybe a bottom ball-joint knocking due to wear.

I've had two cases, one Fiat Panda, one Ulysses, and both had a knock from the front drivers-side when over rough ground and turning right (due to the weight lifting off the suspension). Both cars were only 2 years old, and both sounded like worn drop-links until we checked the bottom ball-joint on the wishbone.

Hope this helps.