My other halfs 52 plate 206 1.9HDi (~53K) has started to make a noise, best described as being like hitting a thick cast iron pipe with a soft faced mallet(!) when going over bumps/potholes. Sounds like its coming from the rear suspension but doesn't do it every time or when there is more weight at the back (eg when there are back seat passengers or the tanks full). Had a look myself but couldn't see anything so have had it into the local garage and they couldn't find anything though they did tighten all the suspension bolts. Car has a towbar fitted (was fitted when we got it but we haven't used it). Any ideas? TIA Dave