Well, after hassling my local,dealer I eventually got them to fit a new set of dampers, just under 1k miles and rattle was back - TBH it was still there on the drive home from garage so I took the plunge and bought some Bilstein dampers .
Only fitted them today but on a quick test drive all is quiet, been out again over roads that would normally have me cringing and reaching for the volume button but all seems good.
When I took the Sachs off I could feel the play in the piston not good after only 1000 miles - the Bilstein piston actually looks a slightly larger diameter.
I’m hoping this has cured it - fingers crossed.
I paid around £90:for the pair, was quoted between £85-100 to fit but after watching a couple of videos on YouTube and taking off the wheels for an inspection decided to have a go - first one was a learning curve (plus trip to shop for an 18mm socket) so took around 45 mins (excluding the shopping trip), did the other in under 30mins - fairly easy job and I’m no mechanic .