To Wayne300C, Penguin 2007 and any other 300C owners who are suffering from the dreaded front end rattle, I can now reveal the result and reason for this noise. As mentioned earlier I had been on US forums and the came problem appears to be world wide. We changed shocks, upper wishbones,(twice),anti roll bar bushes,drop links and track rod ends all to no avail. The problem lies to a large part with the brake calipers. Although we removed the drop links and drove the car without it was less noise but not remedying the overall problem. We fitted a new pair and then decided to strip and check the calipers. Here we found slack in various areas, particularly the carrier. Everything was greased where required and then tightened to what was considered adequate or nessesary. The car now drives as it should apart from on an extreme rut or pothole, I will still get a slight rattle from the offside unit but this said it is a 90% improvement. So from all this, had we started with the calipers first off we would have saved changing many of the other parts. I would guess if the noise starts again at a later date I will have to replace some element of the calipers as they can obviously wear with miles. I hope this helps other owners.