been following various threads on here and elsewhere on the exact same issues.Well got it up on ramps and had a good look underneath again. The RH spring didn't look straight, and was quite badly corroded, so bought a new pair.
Fitted them both, also checked the top mounts again, ensuring they are lined up properly with the indents on the body, put it all back together very carefully, and guess what, the noise is still there.
Seems like the slightest bit of wear in many places can end up causing this issue and are very heard to find.
ive given up worrying about it and ignoring the noises.