My DS has been in once already for a front end knocking noise metal to metal when you go over any sort of bumps or rutted ground. Also at speed it sorts of chatters. It's the sort of noise you get when you drive over a loose cast iron drain cover. Last time it was in they said that there was no fault found, so I went out with a senior member of the garage and he said they would need to investigate further. Its back in next week but wondered if anyone had any ideas as to what might be causing it. I've attached a link to a video I took. It's not great quality but it's just to give you an idea of the noise. Nothing is loose under the DS and the heat shields have already been fixed due to the wrong bolts being used. Appreciate any ideas to pass on to LR