Suspension Knocks On Cabriolet V6 2.8

Hello to you all,

I have an audi v.6 cabriolet 2.8, & recently the suspension on the drivers side front has started knocking, & even on the slightest of bumps it can be heard,to me it sounds like a worn bush somewhere within the set up.I've really only noticed it since the weather has been cold,& wasn't aware of any noise prior to this in the summer. I've read reports on the suspension playing up, but none seem to pin point the possible actual fault. Had it looked at & checked out, & guess what, no play found anywhere!!!

Any help would be greatly appreciated