Galaxy Mk3 knocking

Hi there, im having a issue with a Galaxy Mk3 2.0 TDCI on a 07 plate that has a kind of rattle / knocking coming from the front near side, i have so far changed the top mounts, anti roll bar bushes, drop links and complete lower arms, as well as changed the gear box oil but this sound is still there, the car drives fine and at speed there is no knocking, it only seems to be there when you are going around 30 MPH and not under load, has anyone else come across this problem, being a fairly new model is making it hard to find other people who have had the same problems, this is my sister in laws car and as the sound wasn't there when they purchased the car she is obviously worrying about it